Remove the content settings OverrideProvider

There are 3 reasons for removing this:
1) It is currently unused and untested
2) It has not been updated to not store the setting for each content type in a
   different pref (everything is in one pref). We don't want this because we
   don't want values for all content types to be synced. So it wouldn't be
   useful in its current form anyway.
3) Its existence makes it harder to do refactoring in content settings at the
   moment.

BUG=512683
TBR=markusheintz@chromium.org

Review URL: https://codereview.chromium.org/1252253002

Cr-Commit-Position: refs/heads/master@{#340424}

7 files changed, 4 insertions, 287 deletions

diff --git a/components/content_settings/core/browser/BUILD.gn b/components/content_settings/core/browser/BUILD.gn
index 1c004f7..173ffd6 100644
--- a/components/content_settings/core/browser/BUILD.gn
+++ b/components/content_settings/core/browser/BUILD.gn
@@ -16,8 +16,6 @@ static_library("browser") {
     "content_settings_observer.h",
     "content_settings_origin_identifier_value_map.cc",
     "content_settings_origin_identifier_value_map.h",
-    "content_settings_override_provider.cc",
-    "content_settings_override_provider.h",
     "content_settings_policy_provider.cc",
     "content_settings_policy_provider.h",
     "content_settings_pref.cc",
diff --git a/components/content_settings/core/browser/content_settings_override_provider.cc b/components/content_settings/core/browser/content_settings_override_provider.cc
deleted file mode 100644
index ee04dc9..0000000
--- a/components/content_settings/core/browser/content_settings_override_provider.cc
+++ /dev/null
@@ -1,107 +0,0 @@
-// Copyright 2014 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 "components/content_settings/core/browser/content_settings_override_provider.h"
-
-#include <string>
-
-#include "base/auto_reset.h"
-#include "base/prefs/pref_service.h"
-#include "base/prefs/scoped_user_pref_update.h"
-#include "base/values.h"
-#include "components/content_settings/core/browser/content_settings_binary_value_map.h"
-#include "components/content_settings/core/browser/content_settings_rule.h"
-#include "components/content_settings/core/browser/content_settings_utils.h"
-#include "components/content_settings/core/common/content_settings.h"
-#include "components/content_settings/core/common/content_settings_pattern.h"
-#include "components/content_settings/core/common/pref_names.h"
-#include "components/pref_registry/pref_registry_syncable.h"
-
-namespace content_settings {
-
-// static
-void OverrideProvider::RegisterProfilePrefs(
-    user_prefs::PrefRegistrySyncable* registry) {
-  registry->RegisterDictionaryPref(
-      prefs::kOverrideContentSettings,
-      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
-}
-
-OverrideProvider::OverrideProvider(PrefService* prefs, bool incognito)
-    : prefs_(prefs), is_incognito_(incognito) {
-  DCHECK(prefs_);
-
-  // Read global overrides.
-  ReadOverrideSettings();
-}
-
-OverrideProvider::~OverrideProvider() {
-}
-
-RuleIterator* OverrideProvider::GetRuleIterator(
-    ContentSettingsType content_type,
-    const ResourceIdentifier& resource_identifier,
-    bool incognito) const {
-  scoped_ptr<base::AutoLock> auto_lock(new base::AutoLock(lock_));
-  return allowed_settings_.GetRuleIterator(content_type, resource_identifier,
-                                           auto_lock.Pass());
-}
-
-void OverrideProvider::ClearAllContentSettingsRules(
-    ContentSettingsType content_type) {
-}
-
-bool OverrideProvider::SetWebsiteSetting(
-    const ContentSettingsPattern& primary_pattern,
-    const ContentSettingsPattern& secondary_pattern,
-    ContentSettingsType content_type,
-    const ResourceIdentifier& resource_identifier,
-    base::Value* in_value) {
-  return false;
-}
-
-void OverrideProvider::ShutdownOnUIThread() {
-  DCHECK(prefs_);
-  prefs_ = NULL;
-}
-
-void OverrideProvider::SetOverrideSetting(ContentSettingsType content_type,
-                                          bool enabled) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(prefs_);
-
-  // Disallow incognito to change the state.
-  DCHECK(!is_incognito_);
-
-  base::AutoLock auto_lock(lock_);
-  DictionaryPrefUpdate update(prefs_, prefs::kOverrideContentSettings);
-  base::DictionaryValue* default_settings_dictionary = update.Get();
-  allowed_settings_.SetContentSettingDisabled(content_type, !enabled);
-  if (enabled) {
-    default_settings_dictionary->RemoveWithoutPathExpansion(
-        GetTypeName(content_type), NULL);
-  } else {
-    default_settings_dictionary->SetWithoutPathExpansion(
-        GetTypeName(content_type), new base::FundamentalValue(true));
-  }
-}
-
-bool OverrideProvider::IsEnabled(ContentSettingsType content_type) const {
-  base::AutoLock auto_lock(lock_);
-  return allowed_settings_.IsContentSettingEnabled(content_type);
-}
-
-void OverrideProvider::ReadOverrideSettings() {
-  const base::DictionaryValue* blocked_settings_dictionary =
-      prefs_->GetDictionary(prefs::kOverrideContentSettings);
-
-  for (int type = 0; type < CONTENT_SETTINGS_NUM_TYPES; ++type) {
-    ContentSettingsType content_type = ContentSettingsType(type);
-    if (blocked_settings_dictionary->HasKey(GetTypeName(content_type))) {
-      allowed_settings_.SetContentSettingDisabled(content_type, true);
-    }
-  }
-}
-
-}  // namespace content_settings
diff --git a/components/content_settings/core/browser/content_settings_override_provider.h b/components/content_settings/core/browser/content_settings_override_provider.h
deleted file mode 100644
index ca61f60..0000000
--- a/components/content_settings/core/browser/content_settings_override_provider.h
+++ /dev/null
@@ -1,80 +0,0 @@
-// Copyright 2014 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 COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_OVERRIDE_PROVIDER_H_
-#define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_OVERRIDE_PROVIDER_H_
-
-#include "base/macros.h"
-#include "base/synchronization/lock.h"
-#include "base/threading/thread_checker.h"
-#include "components/content_settings/core/browser/content_settings_binary_value_map.h"
-#include "components/content_settings/core/browser/content_settings_provider.h"
-#include "components/content_settings/core/common/content_settings_types.h"
-
-class ContentSettingsPattern;
-class PrefService;
-
-namespace user_prefs {
-class PrefRegistrySyncable;
-}
-
-namespace content_settings {
-
-// OverrideProvider contains if certain content settings are enabled or
-// globally disabled. It may only be written to using the UI thread, but may be
-// read on any thread.
-class OverrideProvider : public ProviderInterface {
- public:
-  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
-
-  OverrideProvider(PrefService* prefs, bool incognito);
-  ~OverrideProvider() override;
-
-  // ProviderInterface implementations.
-  RuleIterator* GetRuleIterator(ContentSettingsType content_type,
-                                const ResourceIdentifier& resource_identifier,
-                                bool incognito) const override;
-
-  void ClearAllContentSettingsRules(ContentSettingsType content_type) override;
-
-  bool SetWebsiteSetting(const ContentSettingsPattern& primary_pattern,
-                         const ContentSettingsPattern& secondary_pattern,
-                         ContentSettingsType content_type,
-                         const ResourceIdentifier& resource_identifier,
-                         base::Value* value) override;
-
-  void ShutdownOnUIThread() override;
-
-  // Sets if a given |content_type| is |enabled|.
-  void SetOverrideSetting(ContentSettingsType content_type, bool enabled);
-
-  // Returns if |content_type| is enabled. If it is not enabled, the content
-  // setting type is considered globally disabled and acts as though it is
-  // blocked. If it is enabled, the content setting type's permission is granted
-  // by the other providers.
-  bool IsEnabled(ContentSettingsType content_type) const;
-
- private:
-  // Reads the override settings from the preferences service.
-  void ReadOverrideSettings();
-
-  // Copies of the pref data, so that we can read it on the IO thread.
-  BinaryValueMap allowed_settings_;
-
-  PrefService* prefs_;
-
-  bool is_incognito_;
-
-  // Used around accesses to the |override_content_settings_| object to
-  // guarantee thread safety.
-  mutable base::Lock lock_;
-
-  base::ThreadChecker thread_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(OverrideProvider);
-};
-
-}  // namespace content_settings
-
-#endif  // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_OVERRIDE_PROVIDER_H_
diff --git a/components/content_settings/core/browser/host_content_settings_map.cc b/components/content_settings/core/browser/host_content_settings_map.cc
index b76fd31..d11ca9b 100644
--- a/components/content_settings/core/browser/host_content_settings_map.cc
+++ b/components/content_settings/core/browser/host_content_settings_map.cc
@@ -40,7 +40,6 @@ const char* kProviderNames[] = {
   "policy",
   "supervised_user",
   "extension",
-  "override",
   "preference",
   "default"
 };
@@ -62,7 +61,6 @@ content_settings::SettingSource kProviderSourceMap[] = {
   content_settings::SETTING_SOURCE_EXTENSION,
   content_settings::SETTING_SOURCE_USER,
   content_settings::SETTING_SOURCE_USER,
-  content_settings::SETTING_SOURCE_USER,
 };
 static_assert(arraysize(kProviderSourceMap) ==
                    HostContentSettingsMap::NUM_PROVIDER_TYPES,
@@ -98,9 +96,6 @@ HostContentSettingsMap::HostContentSettingsMap(PrefService* prefs,
       new content_settings::DefaultProvider(prefs_, is_off_the_record_);
   default_provider->AddObserver(this);
   content_settings_providers_[DEFAULT_PROVIDER] = default_provider;
-
-  content_settings_providers_[OVERRIDE_PROVIDER] =
-      new content_settings::OverrideProvider(prefs_, is_off_the_record_);
 }
 
 // static
@@ -112,7 +107,6 @@ void HostContentSettingsMap::RegisterProfilePrefs(
   content_settings::DefaultProvider::RegisterProfilePrefs(registry);
   content_settings::PrefProvider::RegisterProfilePrefs(registry);
   content_settings::PolicyProvider::RegisterProfilePrefs(registry);
-  content_settings::OverrideProvider::RegisterProfilePrefs(registry);
 }
 
 void HostContentSettingsMap::RegisterProvider(
@@ -160,8 +154,7 @@ ContentSetting HostContentSettingsMap::GetDefaultContentSetting(
   for (ConstProviderIterator provider = content_settings_providers_.begin();
        provider != content_settings_providers_.end();
        ++provider) {
-    if (provider->first == PREF_PROVIDER ||
-        provider->first == OVERRIDE_PROVIDER)
+    if (provider->first == PREF_PROVIDER)
       continue;
     ContentSetting default_setting =
         GetDefaultContentSettingFromProvider(content_type, provider->second);
@@ -199,8 +192,6 @@ void HostContentSettingsMap::GetSettingsForOneType(
   for (ConstProviderIterator provider = content_settings_providers_.begin();
        provider != content_settings_providers_.end();
        ++provider) {
-    if (provider->first == OVERRIDE_PROVIDER)
-      continue;
     // For each provider, iterate first the incognito-specific rules, then the
     // normal rules.
     if (is_off_the_record_) {
@@ -375,52 +366,6 @@ base::Time HostContentSettingsMap::GetLastUsageByPattern(
       primary_pattern, secondary_pattern, content_type);
 }
 
-ContentSetting HostContentSettingsMap::GetContentSettingWithoutOverride(
-    const GURL& primary_url,
-    const GURL& secondary_url,
-    ContentSettingsType content_type,
-    const std::string& resource_identifier) {
-  scoped_ptr<base::Value> value(GetWebsiteSettingWithoutOverride(
-      primary_url, secondary_url, content_type, resource_identifier, NULL));
-  return content_settings::ValueToContentSetting(value.get());
-}
-
-scoped_ptr<base::Value>
-HostContentSettingsMap::GetWebsiteSettingWithoutOverride(
-    const GURL& primary_url,
-    const GURL& secondary_url,
-    ContentSettingsType content_type,
-    const std::string& resource_identifier,
-    content_settings::SettingInfo* info) const {
-  return GetWebsiteSettingInternal(primary_url,
-                                   secondary_url,
-                                   content_type,
-                                   resource_identifier,
-                                   info,
-                                   false);
-}
-
-void HostContentSettingsMap::SetContentSettingOverride(
-    ContentSettingsType content_type,
-    bool is_enabled) {
-  UsedContentSettingsProviders();
-
-  content_settings::OverrideProvider* override =
-      static_cast<content_settings::OverrideProvider*>(
-          content_settings_providers_[OVERRIDE_PROVIDER]);
-  override->SetOverrideSetting(content_type, is_enabled);
-}
-
-bool HostContentSettingsMap::GetContentSettingOverride(
-    ContentSettingsType content_type) {
-  UsedContentSettingsProviders();
-
-  content_settings::OverrideProvider* override =
-      static_cast<content_settings::OverrideProvider*>(
-          content_settings_providers_[OVERRIDE_PROVIDER]);
-  return override->IsEnabled(content_type);
-}
-
 void HostContentSettingsMap::AddObserver(content_settings::Observer* observer) {
   observers_.AddObserver(observer);
 }
@@ -711,8 +656,7 @@ scoped_ptr<base::Value> HostContentSettingsMap::GetWebsiteSetting(
                                    secondary_url,
                                    content_type,
                                    resource_identifier,
-                                   info,
-                                   true);
+                                   info);
 }
 
 // static
@@ -737,8 +681,7 @@ scoped_ptr<base::Value> HostContentSettingsMap::GetWebsiteSettingInternal(
     const GURL& secondary_url,
     ContentSettingsType content_type,
     const std::string& resource_identifier,
-    content_settings::SettingInfo* info,
-    bool get_override) const {
+    content_settings::SettingInfo* info) const {
   // TODO(msramek): MEDIASTREAM is deprecated. Remove this check when all
   // references to MEDIASTREAM are removed from the code.
   DCHECK_NE(CONTENT_SETTINGS_TYPE_MEDIASTREAM, content_type);
@@ -756,8 +699,6 @@ scoped_ptr<base::Value> HostContentSettingsMap::GetWebsiteSettingInternal(
   for (ConstProviderIterator provider = content_settings_providers_.begin();
        provider != content_settings_providers_.end();
        ++provider) {
-    if (!get_override && provider->first == OVERRIDE_PROVIDER)
-      continue;
 
     scoped_ptr<base::Value> value(
         content_settings::GetContentSettingValueAndPatterns(provider->second,
diff --git a/components/content_settings/core/browser/host_content_settings_map.h b/components/content_settings/core/browser/host_content_settings_map.h
index c77192c..b8f6edb 100644
--- a/components/content_settings/core/browser/host_content_settings_map.h
+++ b/components/content_settings/core/browser/host_content_settings_map.h
@@ -19,7 +19,6 @@
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread_checker.h"
 #include "components/content_settings/core/browser/content_settings_observer.h"
-#include "components/content_settings/core/browser/content_settings_override_provider.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
 #include "components/content_settings/core/common/content_settings_types.h"
@@ -34,7 +33,6 @@ class Value;
 }
 
 namespace content_settings {
-class OverrideProvider;
 class ObservableProvider;
 class ProviderInterface;
 class PrefProvider;
@@ -56,7 +54,6 @@ class HostContentSettingsMap
     POLICY_PROVIDER,
     SUPERVISED_PROVIDER,
     CUSTOM_EXTENSION_PROVIDER,
-    OVERRIDE_PROVIDER,
     PREF_PROVIDER,
     DEFAULT_PROVIDER,
     NUM_PROVIDER_TYPES,
@@ -257,31 +254,6 @@ class HostContentSettingsMap
       const ContentSettingsPattern& secondary_pattern,
       ContentSettingsType content_type);
 
-  // Returns the content setting without considering the global on/off toggle
-  // for the content setting that matches the URLs.
-  ContentSetting GetContentSettingWithoutOverride(
-      const GURL& primary_url,
-      const GURL& secondary_url,
-      ContentSettingsType content_type,
-      const std::string& resource_identifier);
-
-  // Returns the single content setting |value| without considering the
-  // global on/off toggle for the content setting that matches the given
-  // patterns.
-  scoped_ptr<base::Value> GetWebsiteSettingWithoutOverride(
-      const GURL& primary_url,
-      const GURL& secondary_url,
-      ContentSettingsType content_type,
-      const std::string& resource_identifier,
-      content_settings::SettingInfo* info) const;
-
-  // Sets globally if a given |content_type| |is_enabled|.
-  void SetContentSettingOverride(ContentSettingsType content_type,
-                                 bool is_enabled);
-
-  // Returns if a given |content_type| is enabled.
-  bool GetContentSettingOverride(ContentSettingsType content_type);
-
   // Adds/removes an observer for content settings changes.
   void AddObserver(content_settings::Observer* observer);
   void RemoveObserver(content_settings::Observer* observer);
@@ -333,8 +305,7 @@ class HostContentSettingsMap
       const GURL& secondary_url,
       ContentSettingsType content_type,
       const std::string& resource_identifier,
-      content_settings::SettingInfo* info,
-      bool get_override) const;
+      content_settings::SettingInfo* info) const;
 
   content_settings::PrefProvider* GetPrefProvider();
 
diff --git a/components/content_settings/core/common/pref_names.cc b/components/content_settings/core/common/pref_names.cc
index 4e78675..71818e2 100644
--- a/components/content_settings/core/common/pref_names.cc
+++ b/components/content_settings/core/common/pref_names.cc
@@ -93,11 +93,6 @@ const char kDefaultDurableStorageSetting[] =
 const char kMigratedDefaultMediaStreamSetting[] =
     "profile.migrated_default_media_stream_content_settings";
 
-// Dictionary of content settings that can globally disallow all hosts by
-// default. If a value is set, it means the setting is globally disallowed.
-// If a value is not set, it means the setting is allowed.
-const char kOverrideContentSettings[] = "profile.override_content_settings";
-
 // Preferences storing the content settings exceptions.
 const char kContentSettingsCookiesPatternPairs[] =
     "profile.content_settings.exceptions.cookies";
diff --git a/components/content_settings/core/common/pref_names.h b/components/content_settings/core/common/pref_names.h
index d6a5ce6..67fa3e7 100644
--- a/components/content_settings/core/common/pref_names.h
+++ b/components/content_settings/core/common/pref_names.h
@@ -14,7 +14,6 @@ extern const char kContentSettingsVersion[];
 extern const char kContentSettingsPatternPairs[];
 extern const char kContentSettingsWindowLastTabIndex[];
 extern const char kDefaultContentSettings[];
-extern const char kOverrideContentSettings[];
 extern const char kMigratedDefaultContentSettings[];
 
 extern const char kDefaultCookiesSetting[];