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diff --git a/chrome/browser/ui/app_modal_dialogs/js_modal_dialog.h b/chrome/browser/ui/app_modal_dialogs/js_modal_dialog.h
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+++ b/chrome/browser/ui/app_modal_dialogs/js_modal_dialog.h
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+// Copyright (c) 2010 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_UI_APP_MODAL_DIALOGS_JS_MODAL_DIALOG_H_
+#define CHROME_BROWSER_UI_APP_MODAL_DIALOGS_JS_MODAL_DIALOG_H_
+#pragma once
+
+#include <string>
+
+#include "build/build_config.h"
+#include "chrome/browser/ui/app_modal_dialogs/app_modal_dialog.h"
+#include "chrome/common/notification_observer.h"
+#include "chrome/common/notification_registrar.h"
+#include "gfx/native_widget_types.h"
+
+class ExtensionHost;
+class NativeAppModalDialog;
+class TabContents;
+
+namespace IPC {
+class Message;
+}
+
+class JavaScriptAppModalDialogDelegate {
+ public:
+  // AppModalDialog calls this when the dialog is closed.
+  virtual void OnMessageBoxClosed(IPC::Message* reply_msg,
+                                  bool success,
+                                  const std::wstring& prompt) = 0;
+
+  // Indicates whether additional message boxes should be suppressed.
+  virtual void SetSuppressMessageBoxes(bool suppress_message_boxes) = 0;
+
+  // Returns the root native window with which the message box is associated.
+  virtual gfx::NativeWindow GetMessageBoxRootWindow() = 0;
+
+  // Returns the TabContents or ExtensionHost associated with this message
+  // box -- in practice, the object implementing this interface. Exactly one
+  // of these must be non-NULL; behavior is undefined (read: it'll probably
+  // crash) if that is not the case.
+  virtual TabContents* AsTabContents() = 0;
+  virtual ExtensionHost* AsExtensionHost() = 0;
+
+ protected:
+  virtual ~JavaScriptAppModalDialogDelegate() {}
+};
+
+// A controller + model class for JavaScript alert, confirm, prompt, and
+// onbeforeunload dialog boxes.
+class JavaScriptAppModalDialog : public AppModalDialog,
+                                 public NotificationObserver {
+ public:
+  JavaScriptAppModalDialog(JavaScriptAppModalDialogDelegate* delegate,
+                           const std::wstring& title,
+                           int dialog_flags,
+                           const std::wstring& message_text,
+                           const std::wstring& default_prompt_text,
+                           bool display_suppress_checkbox,
+                           bool is_before_unload_dialog,
+                           IPC::Message* reply_msg);
+  virtual ~JavaScriptAppModalDialog();
+
+  // Overridden from AppModalDialog:
+  virtual NativeAppModalDialog* CreateNativeDialog();
+
+  JavaScriptAppModalDialogDelegate* delegate() const { return delegate_; }
+
+  // Callbacks from NativeDialog when the user accepts or cancels the dialog.
+  void OnCancel(bool suppress_js_messages);
+  void OnAccept(const std::wstring& prompt_text, bool suppress_js_messages);
+  void OnClose();
+
+  // Accessors
+  int dialog_flags() const { return dialog_flags_; }
+  std::wstring message_text() const { return message_text_; }
+  std::wstring default_prompt_text() const { return default_prompt_text_; }
+  bool display_suppress_checkbox() const { return display_suppress_checkbox_; }
+  bool is_before_unload_dialog() const { return is_before_unload_dialog_; }
+
+ protected:
+  // Overridden from AppModalDialog:
+  virtual void Cleanup();
+
+ private:
+  // Overridden from NotificationObserver:
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+  // Initializes for notifications to listen.
+  void InitNotifications();
+
+  NotificationRegistrar registrar_;
+
+  // An implementation of the client interface to provide supporting methods
+  // and receive results.
+  JavaScriptAppModalDialogDelegate* delegate_;
+
+  // The client_ as an ExtensionHost, cached for use during notifications that
+  // may arrive after the client has entered its destructor (and is thus
+  // treated as a base Delegate). This will be NULL if the |delegate_| is not an
+  // ExtensionHost.
+  ExtensionHost* extension_host_;
+
+  // Information about the message box is held in the following variables.
+  int dialog_flags_;
+  std::wstring message_text_;
+  std::wstring default_prompt_text_;
+  bool display_suppress_checkbox_;
+  bool is_before_unload_dialog_;
+  IPC::Message* reply_msg_;
+
+  DISALLOW_COPY_AND_ASSIGN(JavaScriptAppModalDialog);
+};
+
+#endif  // CHROME_BROWSER_UI_APP_MODAL_DIALOGS_JS_MODAL_DIALOG_H_