Remove extension permission experiment code.

The experiment ended so let's tear down this wall of code.

BUG=326733

Review URL: https://codereview.chromium.org/978953002

Cr-Commit-Position: refs/heads/master@{#320168}

9 files changed, 80 insertions, 898 deletions

diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index ad0dfd4..90b5d28 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -5254,56 +5254,6 @@ Keep your key file in a safe place. You will need it to create new versions of y
         Hide Details
       </message>
 
-      <!-- Strings for the extensions permission dialog experiment -->
-      <!-- TODO(meacer): Remove these once the experiments are completed. -->
-      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION1">
-        Do you trust this extension to use these privileges safely?
-      </message>
-      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION2">
-        Once installed, this extension could potentially use these privileges to do malicious things to your web browsing experience. Are you sure you want to install this extension?
-      </message>
-      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION3">
-        Are you sure you want to install this extension given that it requires these privileges?
-      </message>
-      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION4">
-        Make sure that these privileges make sense for what you think the extension needs to do. If they do not, click Cancel.
-      </message>
-      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION5">
-        Do you trust this extension to perform these actions?
-      </message>
-
-      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_TRUST" desc="Text for the install button on the extension install prompt (for experiment group 1)">
-        Yes, I trust this extension!
-      </message>
-      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_YES" desc="Text for the install button on the extension install prompt (for experiment group 2)">
-        Yes, install
-      </message>
-      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_SURE" desc="Text for the install button on the extension install prompt (for experiment group 3)">
-        Yes, I'm sure
-      </message>
-      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_TRUST2" desc="Text for the install button on the extension install prompt (for experiment group 4)">
-        Yes, I trust it
-      </message>
-      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_NOPE" desc="Text for the cancel button on the extension install prompt">
-        Nope, cancel
-      </message>
-      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_SHOW_DETAILS" desc="The label of the button which displays permission info when clicked">
-        Show details
-      </message>
-      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_SHOW_PERMISSIONS" desc="The label of the button which displays permission list when clicked">
-        Show permissions
-      </message>
-      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_CHECKBOX_INFO" desc="Text for the label that explains that user should check all checkboxes to process for installation.">
-        Please check all boxes to proceed.
-      </message>
-
-      <message name="IDS_EXTENSION_PROMPT_WARNING_FULL_ACCESS_EXPLANATION" desc="Extra explanation text for full access permission">
-        This extension can read and change all data on your computer and all websites including Google, Facebook, Yahoo, etc.
-      </message>
-      <message name="IDS_EXTENSION_PROMPT_WARNING_ALL_HOSTS_EXPLANATION" desc="Extra explanation text for all sites permission">
-        This extension can read and change your information on all websites including Google, Facebook, Yahoo, etc.
-      </message>
-
       <!-- Global error messages for extensions -->
       <message name="IDS_EXTENSION_WARNINGS_WRENCH_MENU_ITEM" desc="The wrench menu item indicating that extensions caused problems.">
         Extension error
diff --git a/chrome/browser/extensions/extension_install_prompt.cc b/chrome/browser/extensions/extension_install_prompt.cc
index 45047b8..e8dea3cb 100644
--- a/chrome/browser/extensions/extension_install_prompt.cc
+++ b/chrome/browser/extensions/extension_install_prompt.cc
@@ -381,11 +381,6 @@ int ExtensionInstallPrompt::Prompt::GetDialogButtons() const {
   return kButtons[type_];
 }
 
-bool ExtensionInstallPrompt::Prompt::ShouldShowExplanationText() const {
-  return type_ == INSTALL_PROMPT && extension_->is_extension() &&
-         experiment_.get() && experiment_->text_only();
-}
-
 bool ExtensionInstallPrompt::Prompt::HasAcceptButtonLabel() const {
   if (type_ == POST_INSTALL_PERMISSIONS_PROMPT)
     return ShouldDisplayRevokeButton();
@@ -419,21 +414,15 @@ base::string16 ExtensionInstallPrompt::Prompt::GetAcceptButtonLabel() const {
     }
     return l10n_util::GetStringUTF16(id);
   }
-  if (ShouldShowExplanationText())
-    return experiment_->GetOkButtonText();
   return l10n_util::GetStringUTF16(kAcceptButtonIds[type_]);
 }
 
 bool ExtensionInstallPrompt::Prompt::HasAbortButtonLabel() const {
-  if (ShouldShowExplanationText())
-    return true;
   return kAbortButtonIds[type_] > 0;
 }
 
 base::string16 ExtensionInstallPrompt::Prompt::GetAbortButtonLabel() const {
   CHECK(HasAbortButtonLabel());
-  if (ShouldShowExplanationText())
-    return experiment_->GetCancelButtonText();
   return l10n_util::GetStringUTF16(kAbortButtonIds[type_]);
 }
 
@@ -909,11 +898,6 @@ void ExtensionInstallPrompt::LoadImageIfNeeded() {
 }
 
 void ExtensionInstallPrompt::ShowConfirmation() {
-  if (prompt_->type() == INSTALL_PROMPT)
-    prompt_->set_experiment(ExtensionInstallPromptExperiment::Find());
-  else
-    prompt_->set_experiment(ExtensionInstallPromptExperiment::ControlGroup());
-
   scoped_refptr<const PermissionSet> permissions_to_display;
   if (custom_permissions_.get()) {
     permissions_to_display = custom_permissions_;
diff --git a/chrome/browser/extensions/extension_install_prompt.h b/chrome/browser/extensions/extension_install_prompt.h
index 8bb83fa..56b774c 100644
--- a/chrome/browser/extensions/extension_install_prompt.h
+++ b/chrome/browser/extensions/extension_install_prompt.h
@@ -15,7 +15,6 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
-#include "chrome/browser/extensions/extension_install_prompt_experiment.h"
 #include "extensions/common/url_pattern.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/image/image.h"
@@ -141,7 +140,6 @@ class ExtensionInstallPrompt
     base::string16 GetRetainedDevicesHeading() const;
 
     bool ShouldShowPermissions() const;
-    bool ShouldShowExplanationText() const;
 
     // Getters for webstore metadata. Only populated when the type is
     // INLINE_INSTALL_PROMPT.
@@ -200,13 +198,6 @@ class ExtensionInstallPrompt
 
     bool has_webstore_data() const { return has_webstore_data_; }
 
-    const ExtensionInstallPromptExperiment* experiment() const {
-      return experiment_.get();
-    }
-    void set_experiment(ExtensionInstallPromptExperiment* experiment) {
-      experiment_ = experiment;
-    }
-
    private:
     friend class base::RefCountedThreadSafe<Prompt>;
 
@@ -271,8 +262,6 @@ class ExtensionInstallPrompt
     std::vector<base::FilePath> retained_files_;
     std::vector<base::string16> retained_device_messages_;
 
-    scoped_refptr<ExtensionInstallPromptExperiment> experiment_;
-
     DISALLOW_COPY_AND_ASSIGN(Prompt);
   };
 
diff --git a/chrome/browser/extensions/extension_install_prompt_experiment.cc b/chrome/browser/extensions/extension_install_prompt_experiment.cc
deleted file mode 100644
index 499435a..0000000
--- a/chrome/browser/extensions/extension_install_prompt_experiment.cc
+++ /dev/null
@@ -1,250 +0,0 @@
-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "base/metrics/field_trial.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_split.h"
-#include "base/strings/stringprintf.h"
-#include "chrome/browser/extensions/extension_install_prompt_experiment.h"
-#include "chrome/grit/generated_resources.h"
-#include "ui/base/l10n/l10n_util.h"
-
-namespace {
-
-const char kExperimentName[] = "ExtensionPermissionDialog";
-const char kGroupPrefix[] = "Group";
-
-// Flags for groups. Not all combinations make sense.
-// Refer to the UI screens at http://goo.gl/f2KzPj for those that do.
-enum GroupFlag {
-  // No changes (Control group).
-  NONE = 0,
-  // Indicates that the experiment is text only. A text only experiment
-  // only adds an explanation text at the bottom of the permission dialog and
-  // modifies the text on accept/cancel buttons.
-  TEXT_ONLY = 1 << 0,
-  // Indicates that the experiment shows inline explanations for permissions.
-  INLINE_EXPLANATIONS = 1 << 1,
-  // Indicates that the experiment highlights permission text color.
-  SHOULD_HIGHLIGHT_TEXT = 1 << 2,
-  // Indicates that the experiment highlights permission text background.
-  SHOULD_HIGHLIGHT_BACKGROUND = 1 << 3,
-  // Indicates that the experiment highlights all permissions.
-  SHOULD_HIGHLIGHT_ALL_PERMISSIONS = 1 << 4,
-  // Indicates that the experiment puts a "show details" link in the UI.
-  SHOULD_SHOW_DETAILS_LINK = 1 << 5,
-  // Indicates that the experiment hides the permissions by default and the list
-  // can be expanded.
-  EXPANDABLE_PERMISSION_LIST = 1 << 6,
-  // Indicates that the experiment shows checkboxes for each permission.
-  SHOULD_SHOW_CHECKBOXES = 1 << 7
-};
-
-// Flags for the actual experiment groups. These flags define what kind of
-// UI changes each experiment group does. An experiment group may change
-// multiple aspects of the extension install dialog  (e.g. one of the groups
-// show a details link and inline explanations for permissions). The control
-// group doesn't change the UI. Text only groups add a text warning to the UI,
-// with the text changing depending on the group number. Groups with inline
-// explanations show detailed explanations for a subset of permissions. Some
-// groups highlight the foreground or the background of permission texts.
-// The flags reflect the UI screens at http://goo.gl/f2KzPj.
-const unsigned int kGroupFlags[] = {
-  // Control group doesn't change the UI.
-  NONE,
-  // Adds "Do you trust this extension to use these privileges safely" text.
-  TEXT_ONLY,
-  // Adds "Extension can be malicious" text.
-  TEXT_ONLY,
-  // Adds "Are you sure you want to install" text.
-  TEXT_ONLY,
-  // Adds "Make sure these privileges make sense for this extension" text.
-  TEXT_ONLY,
-  // Adds "Do you trust this extension to perform these actions" text.
-  TEXT_ONLY,
-  // Adds inline explanations displayed by default.
-  INLINE_EXPLANATIONS,
-  // Adds expandable inline explanations with a "Show Details" link.
-  SHOULD_SHOW_DETAILS_LINK | INLINE_EXPLANATIONS,
-  // Adds expandable permission list with a "Show Permissions" link.
-  SHOULD_SHOW_DETAILS_LINK | EXPANDABLE_PERMISSION_LIST,
-  // Highlights text for risky permissions.
-  SHOULD_HIGHLIGHT_TEXT,
-  // Highlights background for risky permissions.
-  SHOULD_HIGHLIGHT_BACKGROUND,
-  // Highlights background for all permissions
-  SHOULD_HIGHLIGHT_BACKGROUND | SHOULD_HIGHLIGHT_ALL_PERMISSIONS,
-  // Displays checkboxes for all permissions.
-  SHOULD_SHOW_CHECKBOXES
-};
-
-const size_t kGroupCount = arraysize(kGroupFlags);
-
-// Parameters for text only experiments.
-const struct TextParams {
-  int text_id;
-  int ok_text_id;
-  int cancel_text_id;
-} kTextParams[] = {
-  {
-    IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION1,
-    IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_TRUST,
-    IDS_CANCEL,
-  },
-  {
-    IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION2,
-    IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_YES,
-    IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_NOPE
-  },
-  {
-    IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION3,
-    IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_SURE,
-    IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_NOPE
-  },
-  {
-    IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION4,
-    IDS_EXTENSION_PROMPT_INSTALL_BUTTON,
-    IDS_CANCEL
-  },
-  {
-    IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION5,
-    IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_TRUST2,
-    IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_NOPE
-  }
-};
-
-// Permission warnings in this list have inline explanation texts.
-const struct PermissionExplanations {
-  int warning_msg_id;
-  int extra_explanation_id;
-} kPermissionExplanations[] = {
-  {
-    IDS_EXTENSION_PROMPT_WARNING_FULL_ACCESS,
-    IDS_EXTENSION_PROMPT_WARNING_FULL_ACCESS_EXPLANATION
-  },
-  {
-    IDS_EXTENSION_PROMPT_WARNING_ALL_HOSTS,
-    IDS_EXTENSION_PROMPT_WARNING_ALL_HOSTS_EXPLANATION
-  }
-};
-
-// Permission warnings in this list are going to be highlighted.
-// Note that the matching is done by string comparison, so this list must not
-// contain any dynamic strings (e.g. permission for 3 hosts with the host list).
-const int kHighlightedWarnings[] = {
-  IDS_EXTENSION_PROMPT_WARNING_FULL_ACCESS,
-  IDS_EXTENSION_PROMPT_WARNING_ALL_HOSTS,
-  IDS_EXTENSION_PROMPT_WARNING_BOOKMARKS,
-  IDS_EXTENSION_PROMPT_WARNING_CONTENT_SETTINGS,
-  IDS_EXTENSION_PROMPT_WARNING_HISTORY_WRITE,
-  IDS_EXTENSION_PROMPT_WARNING_INPUT,
-  IDS_EXTENSION_PROMPT_WARNING_MANAGEMENT,
-  IDS_EXTENSION_PROMPT_WARNING_HISTORY_READ,
-  IDS_EXTENSION_PROMPT_WARNING_DEBUGGER
-};
-
-bool IsImportantWarning(const base::string16& message) {
-  for (size_t i = 0; i < arraysize(kHighlightedWarnings); ++i) {
-    if (message == l10n_util::GetStringUTF16(kHighlightedWarnings[i]))
-      return true;
-  }
-  return false;
-}
-
-}  // namespace
-
-ExtensionInstallPromptExperiment::ExtensionInstallPromptExperiment(
-    unsigned int group_id, unsigned int flags)
-    : group_id_(group_id),
-      flags_(flags) {
-}
-
-ExtensionInstallPromptExperiment::~ExtensionInstallPromptExperiment() {
-}
-
-// static
-ExtensionInstallPromptExperiment*
-    ExtensionInstallPromptExperiment::ControlGroup() {
-  return new ExtensionInstallPromptExperiment(0, kGroupFlags[0]);
-}
-
-// static
-ExtensionInstallPromptExperiment*
-    ExtensionInstallPromptExperiment::Find() {
-  base::FieldTrial* trial = base::FieldTrialList::Find(kExperimentName);
-  // Default is control group.
-  unsigned int group_id = 0;
-  if (trial) {
-    std::vector<std::string> tokens;
-    base::SplitString(trial->group_name().c_str(), '_', &tokens);
-    if (tokens.size() == 2 && tokens[0] == kGroupPrefix) {
-      base::StringToUint(tokens[1], &group_id);
-      if (group_id >= kGroupCount)
-        group_id = 0;
-    }
-  }
-  return new ExtensionInstallPromptExperiment(group_id, kGroupFlags[group_id]);
-}
-
-base::string16 ExtensionInstallPromptExperiment::GetExplanationText() const {
-  DCHECK(group_id_ > 0 && group_id_ - 1 < arraysize(kTextParams));
-  return l10n_util::GetStringUTF16(kTextParams[group_id_ - 1].text_id);
-}
-
-base::string16 ExtensionInstallPromptExperiment::GetOkButtonText() const {
-  DCHECK(group_id_ > 0 && group_id_ - 1 < arraysize(kTextParams));
-  return l10n_util::GetStringUTF16(kTextParams[group_id_ - 1].ok_text_id);
-}
-
-base::string16 ExtensionInstallPromptExperiment::GetCancelButtonText() const {
-  DCHECK(group_id_ > 0 && group_id_ - 1 < arraysize(kTextParams));
-  return l10n_util::GetStringUTF16(kTextParams[group_id_ - 1].cancel_text_id);
-}
-
-bool ExtensionInstallPromptExperiment::text_only() const {
-  return (flags_ & TEXT_ONLY) != 0;
-}
-
-bool ExtensionInstallPromptExperiment::ShouldHighlightText(
-    const base::string16& message) const {
-  return (flags_ & SHOULD_HIGHLIGHT_TEXT) != 0 && IsImportantWarning(message);
-}
-
-bool ExtensionInstallPromptExperiment::ShouldHighlightBackground(
-    const base::string16& message) const {
-  return (flags_ & SHOULD_HIGHLIGHT_BACKGROUND) != 0 &&
-      ((flags_ & SHOULD_HIGHLIGHT_ALL_PERMISSIONS) != 0 ||
-      IsImportantWarning(message));
-}
-
-bool ExtensionInstallPromptExperiment::show_details_link() const {
-  return (flags_ & SHOULD_SHOW_DETAILS_LINK) != 0;
-}
-
-bool ExtensionInstallPromptExperiment::show_checkboxes() const {
-  return (flags_ & SHOULD_SHOW_CHECKBOXES) != 0;
-}
-
-bool ExtensionInstallPromptExperiment::should_show_expandable_permission_list()
-    const {
-  return (flags_ & EXPANDABLE_PERMISSION_LIST) != 0;
-}
-
-bool ExtensionInstallPromptExperiment::should_show_inline_explanations() const {
-  return (flags_ & INLINE_EXPLANATIONS) != 0;
-}
-
-base::string16 ExtensionInstallPromptExperiment::GetInlineExplanation(
-    const base::string16& message) const {
-  for (size_t i = 0; i < arraysize(kPermissionExplanations); ++i) {
-    if (message == l10n_util::GetStringUTF16(
-        kPermissionExplanations[i].warning_msg_id)) {
-      return l10n_util::GetStringUTF16(
-          kPermissionExplanations[i].extra_explanation_id);
-    }
-  }
-  return base::string16();
-}
diff --git a/chrome/browser/extensions/extension_install_prompt_experiment.h b/chrome/browser/extensions/extension_install_prompt_experiment.h
deleted file mode 100644
index 630c1d1..0000000
--- a/chrome/browser/extensions/extension_install_prompt_experiment.h
+++ /dev/null
@@ -1,81 +0,0 @@
-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_PROMPT_EXPERIMENT_H_
-#define CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_PROMPT_EXPERIMENT_H_
-
-#include "base/memory/ref_counted.h"
-
-// Represents a permission dialog experiment.
-// TODO(meacer): Remove this class once the ExtensionPermissionDialog
-// experiment is completed (http://crbug.com/308748).
-class ExtensionInstallPromptExperiment
-    : public base::RefCounted<ExtensionInstallPromptExperiment> {
- public:
-  ExtensionInstallPromptExperiment(unsigned int group_id, unsigned int flags);
-
-  // Returns an experiment instance configured by the server. The ownership of
-  // the returned pointer is passed to the caller.
-  static ExtensionInstallPromptExperiment* Find();
-
-  // Returns an experiment instance for the control group. The ownership of the
-  // returned pointer is passed to the caller.
-  static ExtensionInstallPromptExperiment* ControlGroup();
-
-  // Returns true if this is a text only experiment. A text only experiment
-  // only adds an explanation text at the bottom of the permission dialog
-  // and changes the text on the add/cancel buttons.
-  bool text_only() const;
-
-  // The explanation text to be added for text only experiments.
-  base::string16 GetExplanationText() const;
-
-  // The text for the accept button for text only experiments.
-  base::string16 GetOkButtonText() const;
-
-  // The text for the cancel button for text only experiments.
-  base::string16 GetCancelButtonText() const;
-
-  // Returns true if the text color should be highlighted for the given
-  // permission message.
-  bool ShouldHighlightText(const base::string16& message) const;
-
-  // Returns true if the text background should be highlighted for the given
-  // permission message.
-  bool ShouldHighlightBackground(const base::string16& message) const;
-
-  // Returns true if there should be a "Show details" link at the bottom of the
-  // permission dialog.
-  bool show_details_link() const;
-
-  // Returns true if there should be checkboxes next to permissions for the
-  // user to click.
-  bool show_checkboxes() const;
-
-  // Returns true if the permission list should be hidden by default and can
-  // be expanded when necessary.
-  bool should_show_expandable_permission_list() const;
-
-  // Returns true if the experiment should show inline explanations for
-  // permissions.
-  bool should_show_inline_explanations() const;
-
-  // Returns the inline explanation text for the given permission warning.
-  // Returns empty string if there is no corresponding inline explanation.
-  base::string16 GetInlineExplanation(const base::string16& message) const;
-
- private:
-  friend class base::RefCounted<ExtensionInstallPromptExperiment>;
-  ~ExtensionInstallPromptExperiment();
-
-  // Group id of the experiment. The zeroth group is the control group.
-  const unsigned int group_id_;
-  // Bitmask for the changes done to the UI by the experiment. An experiment can
-  // change multiple parts of the UI.
-  const unsigned int flags_;
-
-  DISALLOW_COPY_AND_ASSIGN(ExtensionInstallPromptExperiment);
-};
-
-#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_PROMPT_EXPERIMENT_H_
diff --git a/chrome/browser/ui/views/extensions/extension_install_dialog_view.cc b/chrome/browser/ui/views/extensions/extension_install_dialog_view.cc
index 75d28c0..325fbdd 100644
--- a/chrome/browser/ui/views/extensions/extension_install_dialog_view.cc
+++ b/chrome/browser/ui/views/extensions/extension_install_dialog_view.cc
@@ -16,7 +16,6 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/api/experience_sampling_private/experience_sampling.h"
 #include "chrome/browser/extensions/bundle_installer.h"
-#include "chrome/browser/extensions/extension_install_prompt_experiment.h"
 #include "chrome/browser/extensions/extension_install_prompt_show_params.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ -87,20 +86,6 @@ const int kBundleLeftColumnWidth = 300;
 // this case, so make it wider than normal.
 const int kExternalInstallLeftColumnWidth = 350;
 
-// Lighter color for labels.
-const SkColor kLighterLabelColor = SkColorSetRGB(0x99, 0x99, 0x99);
-
-// Represents an action on a clickable link created by the install prompt
-// experiment. This is used to group the actions in UMA histograms named
-// Extensions.InstallPromptExperiment.ShowDetails and
-// Extensions.InstallPromptExperiment.ShowPermissions.
-enum ExperimentLinkAction {
-  LINK_SHOWN = 0,
-  LINK_NOT_SHOWN,
-  LINK_CLICKED,
-  NUM_LINK_ACTIONS
-};
-
 void AddResourceIcon(const gfx::ImageSkia* skia_image, void* data) {
   views::View* parent = static_cast<views::View*>(data);
   views::ImageView* image_view = new views::ImageView();
@@ -140,34 +125,6 @@ BulletedView::BulletedView(views::View* view) {
   layout->AddView(view);
 }
 
-CheckboxedView::CheckboxedView(views::View* view,
-                               views::ButtonListener* listener) {
-  views::GridLayout* layout = new views::GridLayout(this);
-  SetLayoutManager(layout);
-  views::ColumnSet* column_set = layout->AddColumnSet(0);
-  column_set->AddColumn(views::GridLayout::LEADING,
-                        views::GridLayout::LEADING,
-                        0,
-                        views::GridLayout::USE_PREF,
-                        0,  // No fixed width.
-                        0);
-  column_set->AddColumn(views::GridLayout::LEADING,
-                        views::GridLayout::LEADING,
-                        0,
-                        views::GridLayout::USE_PREF,
-                        0,  // No fixed width.
-                        0);
-  layout->StartRow(0, 0);
-  views::Checkbox* checkbox = new views::Checkbox(base::string16());
-  checkbox->set_listener(listener);
-  // Alignment needs to be explicitly set again here, otherwise the views are
-  // not vertically centered.
-  layout->AddView(checkbox, 1, 1,
-                  views::GridLayout::LEADING, views::GridLayout::CENTER);
-  layout->AddView(view, 1, 1,
-                  views::GridLayout::LEADING, views::GridLayout::CENTER);
-}
-
 void ShowExtensionInstallDialogImpl(
     ExtensionInstallPromptShowParams* show_params,
     ExtensionInstallPrompt::Delegate* delegate,
@@ -201,10 +158,6 @@ ExtensionInstallDialogView::ExtensionInstallDialogView(
       prompt_(prompt),
       scroll_view_(NULL),
       scrollable_(NULL),
-      scrollable_header_only_(NULL),
-      show_details_link_(NULL),
-      checkbox_info_label_(NULL),
-      unchecked_boxes_(0),
       handled_result_(false) {
   InitView();
 }
@@ -215,7 +168,7 @@ ExtensionInstallDialogView::~ExtensionInstallDialogView() {
 }
 
 void ExtensionInstallDialogView::InitView() {
-  // Possible grid layouts without ExtensionPermissionDialog experiment:
+  // Possible grid layouts:
   // Inline install
   //      w/ permissions                 no permissions
   // +--------------------+------+  +--------------+------+
@@ -247,54 +200,6 @@ void ExtensionInstallDialogView::InitView() {
   // +--------------------|      |
   // | permission2        |      |
   // +--------------------+------+
-  //
-  // If the ExtensionPermissionDialog is on, the layout is modified depending
-  // on the experiment group. For text only experiment, a footer is added at the
-  // bottom of the layouts. For others, inline details are added below some of
-  // the permissions.
-  //
-  // Regular install w/ permissions and footer (experiment):
-  // +--------------------+------+
-  // | heading            | icon |
-  // +--------------------|      |
-  // | permissions_header |      |
-  // +--------------------|      |
-  // | permission1        |      |
-  // +--------------------|      |
-  // | permission2        |      |
-  // +--------------------+------+
-  // | footer text        |      |
-  // +--------------------+------+
-  //
-  // Regular install w/ permissions and inline explanations (experiment):
-  // +--------------------+------+
-  // | heading            | icon |
-  // +--------------------|      |
-  // | permissions_header |      |
-  // +--------------------|      |
-  // | permission1        |      |
-  // +--------------------|      |
-  // | explanation1       |      |
-  // +--------------------|      |
-  // | permission2        |      |
-  // +--------------------|      |
-  // | explanation2       |      |
-  // +--------------------+------+
-  //
-  // Regular install w/ permissions and inline explanations (experiment):
-  // +--------------------+------+
-  // | heading            | icon |
-  // +--------------------|      |
-  // | permissions_header |      |
-  // +--------------------|      |
-  // |checkbox|permission1|      |
-  // +--------------------|      |
-  // |checkbox|permission2|      |
-  // +--------------------+------+
-  //
-  // Additionally, links or informational text is added to non-client areas of
-  // the dialog depending on the experiment group.
-
   int left_column_width =
       (prompt_->ShouldShowPermissions() + prompt_->GetRetainedFileCount()) > 0
           ? kPermissionsLeftColumnWidth
@@ -316,27 +221,12 @@ void ExtensionInstallDialogView::InitView() {
       scrollable_, left_column_width, column_set_id, false);
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 
-  if (prompt_->ShouldShowPermissions() &&
-      prompt_->experiment()->should_show_expandable_permission_list()) {
-    // If the experiment should hide the permission list initially, create a
-    // simple layout that contains only the header, extension name and icon.
-    scrollable_header_only_ = new CustomScrollableView();
-    CreateLayout(scrollable_header_only_, left_column_width,
-                 column_set_id, true);
-    scroll_view_->SetContents(scrollable_header_only_);
-  } else {
-    scroll_view_->SetContents(scrollable_);
-  }
+  scroll_view_->SetContents(scrollable_);
 
   int dialog_width = left_column_width + 2 * views::kPanelHorizMargin;
   if (!is_bundle_install())
     dialog_width += views::kPanelHorizMargin + kIconSize + kIconOffset;
 
-  // Widen the dialog for experiment with checkboxes so that the information
-  // label fits the area to the left of the buttons.
-  if (prompt_->experiment()->show_checkboxes())
-    dialog_width += 4 * views::kPanelHorizMargin;
-
   if (prompt_->has_webstore_data()) {
     layout->StartRow(0, column_set_id);
     views::View* rating = new views::View();
@@ -454,8 +344,6 @@ void ExtensionInstallDialogView::InitView() {
                                     base::string16(),
                                     details,
                                     space_for_files_and_devices,
-                                    false,
-                                    true,
                                     false);
     layout->AddView(issue_advice_view);
   }
@@ -481,8 +369,6 @@ void ExtensionInstallDialogView::InitView() {
                                     base::string16(),
                                     details,
                                     space_for_files_and_devices,
-                                    false,
-                                    true,
                                     false);
     layout->AddView(issue_advice_view);
   }
@@ -492,73 +378,12 @@ void ExtensionInstallDialogView::InitView() {
                             prompt_->type(),
                             ExtensionInstallPrompt::NUM_PROMPT_TYPES);
 
-  if (prompt_->ShouldShowPermissions()) {
-    if (prompt_->ShouldShowExplanationText()) {
-      views::ColumnSet* column_set = layout->AddColumnSet(++column_set_id);
-      column_set->AddColumn(views::GridLayout::LEADING,
-                            views::GridLayout::FILL,
-                            1,
-                            views::GridLayout::USE_PREF,
-                            0,
-                            0);
-      // Add two rows of space so that the text stands out.
-      layout->AddPaddingRow(0, 2 * views::kRelatedControlVerticalSpacing);
-
-      layout->StartRow(0, column_set_id);
-      views::Label* explanation =
-          new views::Label(prompt_->experiment()->GetExplanationText());
-      explanation->SetMultiLine(true);
-      explanation->SetHorizontalAlignment(gfx::ALIGN_LEFT);
-      explanation->SizeToFit(left_column_width + kIconSize);
-      layout->AddView(explanation);
-    }
-
-    if (prompt_->experiment()->should_show_expandable_permission_list() ||
-        (prompt_->experiment()->show_details_link() &&
-         prompt_->experiment()->should_show_inline_explanations() &&
-         !inline_explanations_.empty())) {
-      // Don't show the "Show details" link if there are retained
-      // files.  These have their own "Show details" links and having
-      // multiple levels of links is confusing.
-      if (prompt_->GetRetainedFileCount() == 0) {
-        int text_id =
-            prompt_->experiment()->should_show_expandable_permission_list()
-                ? IDS_EXTENSION_PROMPT_EXPERIMENT_SHOW_PERMISSIONS
-                : IDS_EXTENSION_PROMPT_EXPERIMENT_SHOW_DETAILS;
-        show_details_link_ = new views::Link(
-            l10n_util::GetStringUTF16(text_id));
-        show_details_link_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
-        show_details_link_->set_listener(this);
-        UpdateLinkActionHistogram(LINK_SHOWN);
-      } else {
-        UpdateLinkActionHistogram(LINK_NOT_SHOWN);
-      }
-    }
-
-    if (prompt_->experiment()->show_checkboxes()) {
-      checkbox_info_label_ = new views::Label(
-          l10n_util::GetStringUTF16(
-              IDS_EXTENSION_PROMPT_EXPERIMENT_CHECKBOX_INFO));
-      checkbox_info_label_->SetMultiLine(true);
-      checkbox_info_label_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
-      checkbox_info_label_->SetAutoColorReadabilityEnabled(false);
-      checkbox_info_label_->SetEnabledColor(kLighterLabelColor);
-    }
-  }
-
   gfx::Size scrollable_size = scrollable_->GetPreferredSize();
   scrollable_->SetBoundsRect(gfx::Rect(scrollable_size));
   dialog_size_ = gfx::Size(
       dialog_width,
       std::min(scrollable_size.height(), kDialogMaxHeight));
 
-  if (scrollable_header_only_) {
-    gfx::Size header_only_size = scrollable_header_only_->GetPreferredSize();
-    scrollable_header_only_->SetBoundsRect(gfx::Rect(header_only_size));
-    dialog_size_ = gfx::Size(
-        dialog_width, std::min(header_only_size.height(), kDialogMaxHeight));
-  }
-
   std::string event_name = ExperienceSamplingEvent::kExtensionInstallDialog;
   event_name.append(
       ExtensionInstallPrompt::PromptTypeToString(prompt_->type()));
@@ -609,30 +434,10 @@ bool ExtensionInstallDialogView::AddPermissions(
     views::Label* permission_label =
         new views::Label(prompt_->GetPermission(i, perm_type));
 
-    const SkColor kTextHighlight = SK_ColorRED;
-    const SkColor kBackgroundHighlight = SkColorSetRGB(0xFB, 0xF7, 0xA3);
-    if (prompt_->experiment()->ShouldHighlightText(
-            prompt_->GetPermission(i, perm_type))) {
-      permission_label->SetAutoColorReadabilityEnabled(false);
-      permission_label->SetEnabledColor(kTextHighlight);
-    } else if (prompt_->experiment()->ShouldHighlightBackground(
-                   prompt_->GetPermission(i, perm_type))) {
-      permission_label->SetLineHeight(18);
-      permission_label->set_background(
-          views::Background::CreateSolidBackground(kBackgroundHighlight));
-    }
-
     permission_label->SetMultiLine(true);
     permission_label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
-
-    if (prompt_->experiment()->show_checkboxes()) {
-      permission_label->SizeToFit(left_column_width);
-      layout->AddView(new CheckboxedView(permission_label, this));
-      ++unchecked_boxes_;
-    } else {
-      permission_label->SizeToFit(left_column_width - kBulletWidth);
-      layout->AddView(new BulletedView(permission_label));
-    }
+    permission_label->SizeToFit(left_column_width - kBulletWidth);
+    layout->AddView(new BulletedView(permission_label));
 
     // If we have more details to provide, show them in collapsed form.
     if (!prompt_->GetPermissionsDetails(i, perm_type).empty()) {
@@ -645,35 +450,9 @@ bool ExtensionInstallDialogView::AddPermissions(
                                       base::string16(),
                                       details,
                                       left_column_width,
-                                      true,
-                                      true,
-                                      false);
+                                      true);
       layout->AddView(details_container);
     }
-
-    if (prompt_->experiment()->should_show_inline_explanations()) {
-      base::string16 explanation = prompt_->experiment()->GetInlineExplanation(
-          prompt_->GetPermission(i, perm_type));
-      if (!explanation.empty()) {
-        PermissionDetails details;
-        details.push_back(explanation);
-        ExpandableContainerView* container =
-            new ExpandableContainerView(this,
-                                        base::string16(),
-                                        details,
-                                        left_column_width,
-                                        false,
-                                        false,
-                                        true);
-        // Inline explanations are expanded by default if there is
-        // no "Show details" link.
-        if (!prompt_->experiment()->show_details_link())
-          container->ExpandWithoutAnimation();
-        layout->StartRow(0, column_set_id);
-        layout->AddView(container);
-        inline_explanations_.push_back(container);
-      }
-    }
   }
   return true;
 }
@@ -753,29 +532,6 @@ void ExtensionInstallDialogView::ContentsChanged() {
   Layout();
 }
 
-void ExtensionInstallDialogView::ViewHierarchyChanged(
-    const ViewHierarchyChangedDetails& details) {
-  views::DialogDelegateView::ViewHierarchyChanged(details);
-  // Since we want the links to show up in the same visual row as the accept
-  // and cancel buttons, which is provided by the framework, we must add the
-  // buttons to the non-client view, which is the parent of this view.
-  // Similarly, when we're removed from the view hierarchy, we must take care
-  // to clean up those items as well.
-  if (details.child == this) {
-    if (details.is_add) {
-      if (show_details_link_)
-        details.parent->AddChildView(show_details_link_);
-      if (checkbox_info_label_)
-        details.parent->AddChildView(checkbox_info_label_);
-    } else {
-      if (show_details_link_)
-        details.parent->RemoveChildView(show_details_link_);
-      if (checkbox_info_label_)
-        details.parent->RemoveChildView(checkbox_info_label_);
-    }
-  }
-}
-
 int ExtensionInstallDialogView::GetDialogButtons() const {
   int buttons = prompt_->GetDialogButtons();
   // Simply having just an OK button is *not* supported. See comment on function
@@ -836,85 +592,25 @@ base::string16 ExtensionInstallDialogView::GetWindowTitle() const {
 
 void ExtensionInstallDialogView::LinkClicked(views::Link* source,
                                              int event_flags) {
-  if (source == show_details_link_) {
-    UpdateLinkActionHistogram(LINK_CLICKED);
-    // Show details link is used to either reveal whole permission list or to
-    // reveal inline explanations.
-    if (prompt_->experiment()->should_show_expandable_permission_list()) {
-      gfx::Rect bounds = GetWidget()->GetWindowBoundsInScreen();
-      int spacing = bounds.height() -
-          scrollable_header_only_->GetPreferredSize().height();
-      int content_height = std::min(scrollable_->GetPreferredSize().height(),
-                                    kDialogMaxHeight);
-      bounds.set_height(spacing + content_height);
-      scroll_view_->SetContents(scrollable_);
-      GetWidget()->SetBoundsConstrained(bounds);
-      ContentsChanged();
-    } else {
-      ToggleInlineExplanations();
-    }
-    show_details_link_->SetVisible(false);
+  GURL store_url(extension_urls::GetWebstoreItemDetailURLPrefix() +
+                 prompt_->extension()->id());
+  OpenURLParams params(
+      store_url, Referrer(), NEW_FOREGROUND_TAB,
+      ui::PAGE_TRANSITION_LINK,
+      false);
+
+  if (navigator_) {
+    navigator_->OpenURL(params);
   } else {
-    GURL store_url(extension_urls::GetWebstoreItemDetailURLPrefix() +
-                   prompt_->extension()->id());
-    OpenURLParams params(
-        store_url, Referrer(), NEW_FOREGROUND_TAB,
-        ui::PAGE_TRANSITION_LINK,
-        false);
-
-    if (navigator_) {
-      navigator_->OpenURL(params);
-    } else {
-      chrome::ScopedTabbedBrowserDisplayer displayer(
-          profile_, chrome::GetActiveDesktop());
-      displayer.browser()->OpenURL(params);
-    }
-    GetWidget()->Close();
+    chrome::ScopedTabbedBrowserDisplayer displayer(
+        profile_, chrome::GetActiveDesktop());
+    displayer.browser()->OpenURL(params);
   }
-}
-
-void ExtensionInstallDialogView::ToggleInlineExplanations() {
-  for (InlineExplanations::iterator it = inline_explanations_.begin();
-      it != inline_explanations_.end(); ++it)
-    (*it)->ToggleDetailLevel();
+  GetWidget()->Close();
 }
 
 void ExtensionInstallDialogView::Layout() {
   scroll_view_->SetBounds(0, 0, width(), height());
-
-  if (show_details_link_ || checkbox_info_label_) {
-    views::LabelButton* cancel_button = GetDialogClientView()->cancel_button();
-    gfx::Rect parent_bounds = parent()->GetContentsBounds();
-    // By default, layouts have an inset of kButtonHEdgeMarginNew. In order to
-    // align the link horizontally with the left side of the contents of the
-    // layout, put a horizontal margin with this amount.
-    const int horizontal_margin = views::kButtonHEdgeMarginNew;
-    const int vertical_margin = views::kButtonVEdgeMarginNew;
-    int y_buttons = parent_bounds.bottom() -
-        cancel_button->GetPreferredSize().height() - vertical_margin;
-    int max_width = dialog_size_.width() - cancel_button->width() * 2 -
-        horizontal_margin * 2 - views::kRelatedButtonHSpacing;
-    if (show_details_link_) {
-      gfx::Size link_size = show_details_link_->GetPreferredSize();
-      show_details_link_->SetBounds(
-          horizontal_margin,
-          y_buttons + (cancel_button->height() - link_size.height()) / 2,
-          link_size.width(), link_size.height());
-    }
-    if (checkbox_info_label_) {
-      gfx::Size label_size = checkbox_info_label_->GetPreferredSize();
-      checkbox_info_label_->SetBounds(
-          horizontal_margin,
-          y_buttons + (cancel_button->height() - label_size.height()) / 2,
-          label_size.width(), label_size.height());
-      checkbox_info_label_->SizeToFit(max_width);
-    }
-  }
-  // Disable accept button if there are unchecked boxes and
-  // the experiment is on.
-  if (prompt_->experiment()->show_checkboxes())
-    GetDialogClientView()->ok_button()->SetEnabled(unchecked_boxes_ == 0);
-
   DialogDelegateView::Layout();
 }
 
@@ -922,51 +618,18 @@ gfx::Size ExtensionInstallDialogView::GetPreferredSize() const {
   return dialog_size_;
 }
 
-void ExtensionInstallDialogView::ButtonPressed(views::Button* sender,
-                                               const ui::Event& event) {
-  if (std::string(views::Checkbox::kViewClassName) == sender->GetClassName()) {
-    views::Checkbox* checkbox = static_cast<views::Checkbox*>(sender);
-    if (checkbox->checked())
-      --unchecked_boxes_;
-    else
-      ++unchecked_boxes_;
-
-    GetDialogClientView()->ok_button()->SetEnabled(unchecked_boxes_ == 0);
-    checkbox_info_label_->SetVisible(unchecked_boxes_ > 0);
-  }
-}
-
 void ExtensionInstallDialogView::UpdateInstallResultHistogram(bool accepted)
     const {
   if (prompt_->type() == ExtensionInstallPrompt::INSTALL_PROMPT)
     UMA_HISTOGRAM_BOOLEAN("Extensions.InstallPrompt.Accepted", accepted);
 }
 
-void ExtensionInstallDialogView::UpdateLinkActionHistogram(int action_type)
-    const {
-  if (prompt_->experiment()->should_show_expandable_permission_list()) {
-    // The clickable link in the UI is "Show Permissions".
-    UMA_HISTOGRAM_ENUMERATION(
-        "Extensions.InstallPromptExperiment.ShowPermissions",
-        action_type,
-        NUM_LINK_ACTIONS);
-  } else {
-    // The clickable link in the UI is "Show Details".
-    UMA_HISTOGRAM_ENUMERATION(
-        "Extensions.InstallPromptExperiment.ShowDetails",
-        action_type,
-        NUM_LINK_ACTIONS);
-  }
-}
-
 // ExpandableContainerView::DetailsView ----------------------------------------
 
 ExpandableContainerView::DetailsView::DetailsView(int horizontal_space,
-                                                  bool parent_bulleted,
-                                                  bool lighter_color)
+                                                  bool parent_bulleted)
     : layout_(new views::GridLayout(this)),
-      state_(0),
-      lighter_color_(lighter_color) {
+      state_(0) {
   SetLayoutManager(layout_);
   views::ColumnSet* column_set = layout_->AddColumnSet(0);
   // If the parent is using bullets for its items, then a padding of one unit
@@ -992,10 +655,6 @@ void ExpandableContainerView::DetailsView::AddDetail(
       new views::Label(PrepareForDisplay(detail, false));
   detail_label->SetMultiLine(true);
   detail_label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
-  if (lighter_color_) {
-    detail_label->SetEnabledColor(kLighterLabelColor);
-    detail_label->SetAutoColorReadabilityEnabled(false);
-  }
   layout_->AddView(detail_label);
 }
 
@@ -1017,13 +676,11 @@ ExpandableContainerView::ExpandableContainerView(
     const base::string16& description,
     const PermissionDetails& details,
     int horizontal_space,
-    bool parent_bulleted,
-    bool show_expand_link,
-    bool lighter_color_details)
+    bool parent_bulleted)
     : owner_(owner),
       details_view_(NULL),
-      more_details_(NULL),
       slide_animation_(this),
+      more_details_(NULL),
       arrow_toggle_(NULL),
       expanded_(false) {
   views::GridLayout* layout = new views::GridLayout(this);
@@ -1049,8 +706,7 @@ ExpandableContainerView::ExpandableContainerView(
   if (details.empty())
     return;
 
-  details_view_ = new DetailsView(horizontal_space, parent_bulleted,
-                                  lighter_color_details);
+  details_view_ = new DetailsView(horizontal_space, parent_bulleted);
 
   layout->StartRow(0, column_set_id);
   layout->AddView(details_view_);
@@ -1058,60 +714,57 @@ ExpandableContainerView::ExpandableContainerView(
   for (size_t i = 0; i < details.size(); ++i)
     details_view_->AddDetail(details[i]);
 
-  // TODO(meacer): Remove show_expand_link when the experiment is completed.
-  if (show_expand_link) {
-    views::Link* link = new views::Link(
-        l10n_util::GetStringUTF16(IDS_EXTENSIONS_SHOW_DETAILS));
+  views::Link* link = new views::Link(
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_SHOW_DETAILS));
+
+  // Make sure the link width column is as wide as needed for both Show and
+  // Hide details, so that the arrow doesn't shift horizontally when we
+  // toggle.
+  int link_col_width =
+      views::kRelatedControlHorizontalSpacing +
+      std::max(gfx::GetStringWidth(
+                   l10n_util::GetStringUTF16(IDS_EXTENSIONS_HIDE_DETAILS),
+                   link->font_list()),
+               gfx::GetStringWidth(
+                   l10n_util::GetStringUTF16(IDS_EXTENSIONS_SHOW_DETAILS),
+                   link->font_list()));
+
+  column_set = layout->AddColumnSet(++column_set_id);
+  // Padding to the left of the More Details column. If the parent is using
+  // bullets for its items, then a padding of one unit will make the child
+  // item (which has no bullet) look like a sibling of its parent. Therefore
+  // increase the indentation by one more unit to show that it is in fact a
+  // child item (with no missing bullet) and not a sibling.
+  column_set->AddPaddingColumn(
+      0, views::kRelatedControlHorizontalSpacing * (parent_bulleted ? 2 : 1));
+  // The More Details column.
+  column_set->AddColumn(views::GridLayout::LEADING,
+                        views::GridLayout::LEADING,
+                        0,
+                        views::GridLayout::FIXED,
+                        link_col_width,
+                        link_col_width);
+  // The Up/Down arrow column.
+  column_set->AddColumn(views::GridLayout::LEADING,
+                        views::GridLayout::LEADING,
+                        0,
+                        views::GridLayout::USE_PREF,
+                        0,
+                        0);
 
-    // Make sure the link width column is as wide as needed for both Show and
-    // Hide details, so that the arrow doesn't shift horizontally when we
-    // toggle.
-    int link_col_width =
-        views::kRelatedControlHorizontalSpacing +
-        std::max(gfx::GetStringWidth(
-                     l10n_util::GetStringUTF16(IDS_EXTENSIONS_HIDE_DETAILS),
-                     link->font_list()),
-                 gfx::GetStringWidth(
-                     l10n_util::GetStringUTF16(IDS_EXTENSIONS_SHOW_DETAILS),
-                     link->font_list()));
-
-    column_set = layout->AddColumnSet(++column_set_id);
-    // Padding to the left of the More Details column. If the parent is using
-    // bullets for its items, then a padding of one unit will make the child
-    // item (which has no bullet) look like a sibling of its parent. Therefore
-    // increase the indentation by one more unit to show that it is in fact a
-    // child item (with no missing bullet) and not a sibling.
-    column_set->AddPaddingColumn(
-        0, views::kRelatedControlHorizontalSpacing * (parent_bulleted ? 2 : 1));
-    // The More Details column.
-    column_set->AddColumn(views::GridLayout::LEADING,
-                          views::GridLayout::LEADING,
-                          0,
-                          views::GridLayout::FIXED,
-                          link_col_width,
-                          link_col_width);
-    // The Up/Down arrow column.
-    column_set->AddColumn(views::GridLayout::LEADING,
-                          views::GridLayout::LEADING,
-                          0,
-                          views::GridLayout::USE_PREF,
-                          0,
-                          0);
+  // Add the More Details link.
+  layout->StartRow(0, column_set_id);
+  more_details_ = link;
+  more_details_->set_listener(this);
+  more_details_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
+  layout->AddView(more_details_);
 
-    // Add the More Details link.
-    layout->StartRow(0, column_set_id);
-    more_details_ = link;
-    more_details_->set_listener(this);
-    more_details_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
-    layout->AddView(more_details_);
-
-    // Add the arrow after the More Details link.
-    ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
-    arrow_toggle_ = new views::ImageButton(this);
-    arrow_toggle_->SetImage(views::Button::STATE_NORMAL,
-                            rb.GetImageSkiaNamed(IDR_DOWN_ARROW));
-    layout->AddView(arrow_toggle_);
-  }
+  // Add the arrow after the More Details link.
+  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
+  arrow_toggle_ = new views::ImageButton(this);
+  arrow_toggle_->SetImage(views::Button::STATE_NORMAL,
+                          rb.GetImageSkiaNamed(IDR_DOWN_ARROW));
+  layout->AddView(arrow_toggle_);
 }
 
 ExpandableContainerView::~ExpandableContainerView() {
@@ -1168,11 +821,6 @@ void ExpandableContainerView::ToggleDetailLevel() {
     slide_animation_.Show();
 }
 
-void ExpandableContainerView::ExpandWithoutAnimation() {
-  expanded_ = true;
-  details_view_->AnimateToState(1.0);
-}
-
 // static
 ExtensionInstallPrompt::ShowDialogCallback
 ExtensionInstallPrompt::GetDefaultShowDialogCallback() {
diff --git a/chrome/browser/ui/views/extensions/extension_install_dialog_view.h b/chrome/browser/ui/views/extensions/extension_install_dialog_view.h
index 93d721c..c904edd 100644
--- a/chrome/browser/ui/views/extensions/extension_install_dialog_view.h
+++ b/chrome/browser/ui/views/extensions/extension_install_dialog_view.h
@@ -14,7 +14,6 @@
 #include "ui/views/window/dialog_delegate.h"
 
 typedef std::vector<base::string16> PermissionDetails;
-class ExpandableContainerView;
 class ExtensionInstallPromptShowParams;
 class Profile;
 
@@ -51,8 +50,7 @@ class CustomScrollableView : public views::View {
 
 // Implements the extension installation dialog for TOOLKIT_VIEWS.
 class ExtensionInstallDialogView : public views::DialogDelegateView,
-                                   public views::LinkListener,
-                                   public views::ButtonListener {
+                                   public views::LinkListener {
  public:
   ExtensionInstallDialogView(
       Profile* profile,
@@ -79,18 +77,10 @@ class ExtensionInstallDialogView : public views::DialogDelegateView,
   base::string16 GetWindowTitle() const override;
   void Layout() override;
   gfx::Size GetPreferredSize() const override;
-  void ViewHierarchyChanged(
-      const ViewHierarchyChangedDetails& details) override;
 
   // views::LinkListener:
   void LinkClicked(views::Link* source, int event_flags) override;
 
-  // views::ButtonListener:
-  void ButtonPressed(views::Button* sender, const ui::Event& event) override;
-
-  // Experimental: Toggles inline permission explanations with an animation.
-  void ToggleInlineExplanations();
-
   // Initializes the dialog view, adding in permissions if they exist.
   void InitView();
 
@@ -123,10 +113,6 @@ class ExtensionInstallDialogView : public views::DialogDelegateView,
   // Updates the histogram that holds installation accepted/aborted data.
   void UpdateInstallResultHistogram(bool accepted) const;
 
-  // Updates the histogram that holds data about whether "Show details" or
-  // "Show permissions" links were shown and/or clicked.
-  void UpdateLinkActionHistogram(int action_type) const;
-
   Profile* profile_;
   content::PageNavigator* navigator_;
   ExtensionInstallPrompt::Delegate* delegate_;
@@ -139,29 +125,9 @@ class ExtensionInstallDialogView : public views::DialogDelegateView,
   // The container view for the scroll view.
   CustomScrollableView* scrollable_;
 
-  // The container for the simpler view with only the dialog header and the
-  // extension icon. Used for the experiment where the permissions are
-  // initially hidden when the dialog shows.
-  CustomScrollableView* scrollable_header_only_;
-
   // The preferred size of the dialog.
   gfx::Size dialog_size_;
 
-  // Experimental: "Show details" link to expand inline explanations and reveal
-  // permision dialog.
-  views::Link* show_details_link_;
-
-  // Experimental: Label for showing information about the checkboxes.
-  views::Label* checkbox_info_label_;
-
-  // Experimental: Contains pointers to inline explanation views.
-  typedef std::vector<ExpandableContainerView*> InlineExplanations;
-  InlineExplanations inline_explanations_;
-
-  // Experimental: Number of unchecked checkboxes in the permission list.
-  // If this becomes zero, the accept button is enabled, otherwise disabled.
-  int unchecked_boxes_;
-
   // ExperienceSampling: Track this UI event.
   scoped_ptr<extensions::ExperienceSamplingEvent> sampling_event_;
 
@@ -181,16 +147,6 @@ class BulletedView : public views::View {
   DISALLOW_COPY_AND_ASSIGN(BulletedView);
 };
 
-// A simple view that prepends a view with a checkbox with the help of a grid
-// layout. Used for the permission experiment.
-// TODO(meacer): Remove once the experiment is completed.
-class CheckboxedView : public views::View {
- public:
-  CheckboxedView(views::View* view, views::ButtonListener* listener);
- private:
-  DISALLOW_COPY_AND_ASSIGN(CheckboxedView);
-};
-
 // A view to display text with an expandable details section.
 class ExpandableContainerView : public views::View,
                                 public views::ButtonListener,
@@ -201,9 +157,7 @@ class ExpandableContainerView : public views::View,
                           const base::string16& description,
                           const PermissionDetails& details,
                           int horizontal_space,
-                          bool parent_bulleted,
-                          bool show_expand_link,
-                          bool lighter_color_details);
+                          bool parent_bulleted);
   ~ExpandableContainerView() override;
 
   // views::View:
@@ -219,19 +173,11 @@ class ExpandableContainerView : public views::View,
   void AnimationProgressed(const gfx::Animation* animation) override;
   void AnimationEnded(const gfx::Animation* animation) override;
 
-  // Expand/Collapse the detail section for this ExpandableContainerView.
-  void ToggleDetailLevel();
-
-  // Expand the detail section without any animation.
-  // TODO(meacer): Remove once the experiment is completed.
-  void ExpandWithoutAnimation();
-
  private:
   // A view which displays all the details of an IssueAdviceInfoEntry.
   class DetailsView : public views::View {
    public:
-    explicit DetailsView(int horizontal_space, bool parent_bulleted,
-                         bool lighter_color);
+    DetailsView(int horizontal_space, bool parent_bulleted);
     ~DetailsView() override {}
 
     // views::View:
@@ -246,24 +192,24 @@ class ExpandableContainerView : public views::View,
     views::GridLayout* layout_;
     double state_;
 
-    // Whether the detail text should be shown with a lighter color.
-    bool lighter_color_;
-
     DISALLOW_COPY_AND_ASSIGN(DetailsView);
   };
 
+  // Expand/Collapse the detail section for this ExpandableContainerView.
+  void ToggleDetailLevel();
+
   // The dialog that owns |this|. It's also an ancestor in the View hierarchy.
   ExtensionInstallDialogView* owner_;
 
   // A view for showing |issue_advice.details|.
   DetailsView* details_view_;
 
+  gfx::SlideAnimation slide_animation_;
+
   // The 'more details' link shown under the heading (changes to 'hide details'
   // when the details section is expanded).
   views::Link* more_details_;
 
-  gfx::SlideAnimation slide_animation_;
-
   // The up/down arrow next to the 'more detail' link (points up/down depending
   // on whether the details section is expanded).
   views::ImageButton* arrow_toggle_;
diff --git a/chrome/browser/ui/views/extensions/extension_install_dialog_view_browsertest.cc b/chrome/browser/ui/views/extensions/extension_install_dialog_view_browsertest.cc
index 2de6c33..801bc28 100644
--- a/chrome/browser/ui/views/extensions/extension_install_dialog_view_browsertest.cc
+++ b/chrome/browser/ui/views/extensions/extension_install_dialog_view_browsertest.cc
@@ -8,7 +8,6 @@
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_icon_manager.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
-#include "chrome/browser/extensions/extension_install_prompt_experiment.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/webui/extensions/extension_settings_handler.h"
@@ -114,7 +113,6 @@ void ExtensionInstallDialogViewTestBase::SetUpOnMainThread() {
 
   install_prompt_ = new MockExtensionInstallPrompt(web_contents_);
   install_prompt_->set_prompt(prompt_.get());
-  prompt_->set_experiment(ExtensionInstallPromptExperiment::ControlGroup());
   prompt_->set_extension(extension_);
 
   scoped_ptr<ExtensionIconManager> icon_manager(new ExtensionIconManager());
diff --git a/chrome/chrome_browser_extensions.gypi b/chrome/chrome_browser_extensions.gypi
index a100bd3..6466702 100644
--- a/chrome/chrome_browser_extensions.gypi
+++ b/chrome/chrome_browser_extensions.gypi
@@ -582,8 +582,6 @@
       'browser/extensions/extension_install_checker.h',
       'browser/extensions/extension_install_prompt.cc',
       'browser/extensions/extension_install_prompt.h',
-      'browser/extensions/extension_install_prompt_experiment.cc',
-      'browser/extensions/extension_install_prompt_experiment.h',
       'browser/extensions/extension_install_prompt_show_params.cc',
       'browser/extensions/extension_install_prompt_show_params.h',
       'browser/extensions/extension_install_ui_util.cc',