content: convert zoom notifications to observer usage

chrome/browser/ui/toolbar/wrench_menu_model.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_TOOLBAR_WRENCH_MENU_MODEL_H_
 #define CHROME_BROWSER_UI_TOOLBAR_WRENCH_MENU_MODEL_H_
 
 #include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
+#include "content/public/browser/host_zoom_map.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/base/models/button_menu_item_model.h"
 #include "ui/base/models/simple_menu_model.h"
 
 class BookmarkSubMenuModel;
 class Browser;
 class GlobalError;
 class RecentTabsSubMenuModel;
@@ skipping 49 matching lines @@
   scoped_ptr<EncodingMenuModel> encoding_menu_model_;
 
   DISALLOW_COPY_AND_ASSIGN(ToolsMenuModel);
 };
 
 // A menu model that builds the contents of the wrench menu.
 class WrenchMenuModel : public ui::SimpleMenuModel,
                         public ui::SimpleMenuModel::Delegate,
                         public ui::ButtonMenuItemModel::Delegate,
                         public TabStripModelObserver,
+                        public content::HostZoomMap::Observer,
                         public content::NotificationObserver {
  public:
   // TODO: remove |is_new_menu| and |supports_new_separators|.
   WrenchMenuModel(ui::AcceleratorProvider* provider,
                   Browser* browser,
                   bool is_new_menu,
                   bool supports_new_separators);
   virtual ~WrenchMenuModel();
 
   // Overridden for ButtonMenuItemModel::Delegate:
@@ skipping 16 matching lines @@
   virtual void ActiveTabChanged(content::WebContents* old_contents,
                                 content::WebContents* new_contents,
                                 int index,
                                 bool user_gesture) OVERRIDE;
   virtual void TabReplacedAt(TabStripModel* tab_strip_model,
                              content::WebContents* old_contents,
                              content::WebContents* new_contents,
                              int index) OVERRIDE;
   virtual void TabStripModelDeleted() OVERRIDE;
 
+  // Overriden from content::HostZoomMap::Observer:
+  virtual void OnZoomLevelChanged(const std::string& host) OVERRIDE;
+
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Getters.
   Browser* browser() const { return browser_; }
 
   BookmarkSubMenuModel* bookmark_sub_menu_model() const {
     return bookmark_sub_menu_model_.get();
@@ skipping 48 matching lines @@
 
   Browser* browser_;  // weak
   TabStripModel* tab_strip_model_; // weak
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(WrenchMenuModel);
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_WRENCH_MENU_MODEL_H_