Switch ZoomTabHelper to use WebContentsUserData.

chrome/browser/ui/zoom/zoom_controller.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_ZOOM_ZOOM_CONTROLLER_H_
 #define CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/api/prefs/pref_member.h"
+#include "chrome/browser/tab_contents/web_contents_user_data.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_observer.h"
 
-class TabContents;
 class ZoomObserver;
 
+namespace content {
+class WebContents;
+}
+
 // Per-tab class to manage the Omnibox zoom icon.
 class ZoomController : public content::NotificationObserver,
-                       public content::WebContentsObserver {
+                       public content::WebContentsObserver,
+                       public WebContentsUserData<ZoomController> {
  public:
-  explicit ZoomController(TabContents* tab_contents);
   virtual ~ZoomController();
 
   int zoom_percent() const { return zoom_percent_; }
 
   // Convenience method to quickly check if the tab's at default zoom.
   bool IsAtDefaultZoom() const;
 
   // Returns which image should be loaded for the current zoom level.
   int GetResourceForZoomLevel() const;
 
   void set_observer(ZoomObserver* observer) { observer_ = observer; }
 
  private:
+  explicit ZoomController(content::WebContents* web_contents);
+  static int kUserDataKey;
+  friend class WebContentsUserData<ZoomController>;
+
   // content::WebContentsObserver overrides:
   virtual void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) OVERRIDE;
 
   // content::NotificationObserver overrides:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Updates the zoom icon and zoom percentage based on current values and
   // notifies the observer if changes have occurred. |can_show_bubble| will be
   // true only if the active window changes the zoom on the current page (i.e.,
   // inactive window zoom changes, creating a new tab/window, or shifting
   // between tabs/windows, although they may involve a change in the zoom,
   // should not trigger showing a bubble).
   void UpdateState(bool can_show_bubble);
 
   // The current zoom percentage.
   int zoom_percent_;
 
   content::NotificationRegistrar registrar_;
 
   // Used to access the default zoom level preference.
   DoublePrefMember default_zoom_level_;
 
-  // TabContents that owns this instance.
-  TabContents* tab_contents_;
-
   // Observer receiving notifications on state changes.
   ZoomObserver* observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ZoomController);
 };
 
 #endif  // CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_