Switch Extensions::TabHelper to use WebContents, WebContentsUserData.

content/public/browser/web_contents_observer.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 CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 
 #include "base/callback_forward.h"
 #include "base/process_util.h"
 #include "content/common/content_export.h"
@@ skipping 104 matching lines @@
   // Notication that the given plugin has hung or become unhung. This
   // notification is only for Pepper plugins.
   //
   // The plugin_child_id is the unique child process ID from the plugin. Note
   // that this ID is supplied by the renderer, so should be validated before
   // it's used for anything in case there's an exploited renderer.
   virtual void PluginHungStatusChanged(int plugin_child_id,
                                        const FilePath& plugin_path,
                                        bool is_hung) {}
 
+  // Invoked when WebContents::Clone() was used to clone a WebContents.
+  virtual void DidCloneToNewWebContents(WebContents* old_web_contents,
+                                        WebContents* new_web_contents) {}
+
   // Invoked when the WebContents is being destroyed. Gives subclasses a chance
   // to cleanup. At the time this is invoked |web_contents()| returns NULL.
   // It is safe to delete 'this' from here.
   virtual void WebContentsDestroyed(WebContents* web_contents) {}
 
   // Called when the user agent override for a WebContents has been changed.
   virtual void UserAgentOverrideSet(const std::string& user_agent) {}
 
   // Requests permission to access the PPAPI broker. If the object handles the
   // request, it should return true and eventually call the passed in |callback|
@@ skipping 39 matching lines @@
   void WebContentsImplDestroyed();
 
   WebContentsImpl* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_