Remove notifications from the sad tab helper.

chrome/browser/ui/sad_tab_helper.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_SAD_TAB_HELPER_H_
 #define CHROME_BROWSER_UI_SAD_TAB_HELPER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 namespace chrome {
 class SadTab;
 }
 
 // Per-tab class to manage sad tab views.
 class SadTabHelper : public content::WebContentsObserver,
-                     public content::NotificationObserver,
                      public content::WebContentsUserData<SadTabHelper> {
  public:
   virtual ~SadTabHelper();
 
   chrome::SadTab* sad_tab() { return sad_tab_.get(); }
 
  private:
   friend class content::WebContentsUserData<SadTabHelper>;
 
   explicit SadTabHelper(content::WebContents* web_contents);
 
   void InstallSadTab(base::TerminationStatus status);
 
   // Overridden from content::WebContentsObserver:
+  virtual void RenderViewReady() OVERRIDE;
   virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
 
-  // Overridden from content::NotificationObserver:
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
-
-  // Used to get notifications about renderers coming and going.
-  content::NotificationRegistrar registrar_;
-
   scoped_ptr<chrome::SadTab> sad_tab_;
 
   DISALLOW_COPY_AND_ASSIGN(SadTabHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_SAD_TAB_HELPER_H_