Remove content::NotificationObserver dependency from most Prefs code.

chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.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_LOCATION_BAR_LOCATION_BAR_VIEW_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_LOCATION_BAR_LOCATION_BAR_VIEW_MAC_H_
 
 #include <string>
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/memory/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
+#include "base/prefs/public/pref_observer.h"
 #include "chrome/browser/api/prefs/pref_member.h"
 #include "chrome/browser/extensions/image_loading_tracker.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h"
 #include "chrome/browser/ui/omnibox/location_bar.h"
 #include "chrome/browser/ui/omnibox/omnibox_edit_controller.h"
 #include "chrome/browser/ui/toolbar/toolbar_model.h"
 #include "chrome/common/content_settings_types.h"
 
 @class AutocompleteTextField;
@@ skipping 12 matching lines @@
 class WebIntentsButtonDecoration;
 class ZoomDecoration;
 
 // A C++ bridge class that represents the location bar UI element to
 // the portable code.  Wires up an OmniboxViewMac instance to
 // the location bar text field, which handles most of the work.
 
 class LocationBarViewMac : public LocationBar,
                            public LocationBarTesting,
                            public OmniboxEditController,
-                           public content::NotificationObserver {
+                           public content::NotificationObserver,
+                           public PrefObserver {
  public:
   LocationBarViewMac(AutocompleteTextField* field,
                      CommandUpdater* command_updater,
                      ToolbarModel* toolbar_model,
                      Profile* profile,
                      Browser* browser);
   virtual ~LocationBarViewMac();
 
   // Overridden from LocationBar:
   virtual void ShowFirstRunBubble() OVERRIDE;
@@ skipping 115 matching lines @@
   NSImage* GetKeywordImage(const string16& keyword);
 
   AutocompleteTextField* GetAutocompleteTextField() { return field_; }
 
 
   // content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
+  // PrefObserver:
+  virtual void OnPreferenceChanged(PrefServiceBase* service,
+                                   const std::string& pref_name) OVERRIDE;
+
   Browser* browser() const { return browser_; }
 
  private:
   // Posts |notification| to the default notification center.
   void PostNotification(NSString* notification);
 
   // Return the decoration for |page_action|.
   PageActionDecoration* GetPageActionDecoration(ExtensionAction* page_action);
 
   // Clear the page-action decorations.
@@ skipping 90 matching lines @@
   // Used to schedule a task for the first run info bubble.
   base::WeakPtrFactory<LocationBarViewMac> weak_ptr_factory_;
 
   // Used to change the visibility of the star decoration.
   BooleanPrefMember edit_bookmarks_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(LocationBarViewMac);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_LOCATION_BAR_LOCATION_BAR_VIEW_MAC_H_