Revert 170483 - Remove PrefObserver usages, batch 12.

chrome/browser/ui/cocoa/browser_window_cocoa.h

 // Copyright (c) 2012 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_COCOA_BROWSER_WINDOW_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_COCOA_H_
 
 #include "base/memory/scoped_nsobject.h"
 #include "base/memory/weak_ptr.h"
 #include "base/prefs/public/pref_change_registrar.h"
+#include "base/prefs/public/pref_observer.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/extensions/extension_keybinding_registry.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "ui/base/ui_base_types.h"
 
 class Browser;
 @class BrowserWindowController;
 @class FindBarCocoaController;
 @class NSEvent;
 @class NSMenu;
 @class NSWindow;
 
 namespace extensions {
 class ActiveTabPermissionGranter;
 class Extension;
 }
 
 // An implementation of BrowserWindow for Cocoa. Bridges between C++ and
 // the Cocoa NSWindow. Cross-platform code will interact with this object when
 // it needs to manipulate the window.
 
 class BrowserWindowCocoa :
     public BrowserWindow,
+    public PrefObserver,
     public extensions::ExtensionKeybindingRegistry::Delegate {
  public:
   BrowserWindowCocoa(Browser* browser,
                      BrowserWindowController* controller);
   virtual ~BrowserWindowCocoa();
 
   // Overridden from BrowserWindow
   virtual void Show() OVERRIDE;
   virtual void ShowInactive() OVERRIDE;
   virtual void Hide() OVERRIDE;
@@ skipping 93 matching lines @@
   virtual gfx::Rect GetInstantBounds() OVERRIDE;
   virtual bool IsInstantTabShowing() OVERRIDE;
   virtual WindowOpenDisposition GetDispositionForPopupBounds(
       const gfx::Rect& bounds) OVERRIDE;
   virtual FindBar* CreateFindBar() OVERRIDE;
   virtual bool GetConstrainedWindowTopY(int* top_y) OVERRIDE;
   virtual void ShowAvatarBubble(content::WebContents* web_contents,
                                 const gfx::Rect& rect) OVERRIDE;
   virtual void ShowAvatarBubbleFromAvatarButton() OVERRIDE;
 
+  // Overridden from NotificationObserver
+  virtual void OnPreferenceChanged(PrefServiceBase* service,
+                                   const std::string& pref_name) OVERRIDE;
+
   // Overridden from ExtensionKeybindingRegistry::Delegate:
   virtual extensions::ActiveTabPermissionGranter*
       GetActiveTabPermissionGranter() OVERRIDE;
 
   // Adds the given FindBar cocoa controller to this browser window.
   void AddFindBar(FindBarCocoaController* find_bar_cocoa_controller);
 
   // Returns the cocoa-world BrowserWindowController
   BrowserWindowController* cocoa_controller() { return controller_; }
 
  protected:
   virtual void DestroyBrowser() OVERRIDE;
 
  private:
-  virtual void OnShowBookmarkBarChanged();
   NSWindow* window() const;  // Accessor for the (current) |NSWindow|.
 
   PrefChangeRegistrar pref_change_registrar_;
   Browser* browser_;  // weak, owned by controller
   BrowserWindowController* controller_;  // weak, owns us
   base::WeakPtrFactory<Browser> confirm_close_factory_;
   scoped_nsobject<NSString> pending_window_title_;
   ui::WindowShowState initial_show_state_;
   NSInteger attention_request_id_;  // identifier from requestUserAttention
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_COCOA_H_