Make using WebContentsUserData simpler.

chrome/browser/ui/blocked_content/blocked_content_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_BLOCKED_CONTENT_BLOCKED_CONTENT_TAB_HELPER_H_
 #define CHROME_BROWSER_UI_BLOCKED_CONTENT_BLOCKED_CONTENT_TAB_HELPER_H_
 
 #include "chrome/browser/common/web_contents_user_data.h"
 #include "chrome/browser/ui/find_bar/find_bar_controller.h"
 #include "chrome/browser/ui/find_bar/find_notification_details.h"
@@ skipping 44 matching lines @@
   void GetBlockedContents(
       std::vector<content::WebContents*>* blocked_contents) const;
 
   // content::WebContentsObserver overrides:
   virtual void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) OVERRIDE;
 
  private:
   explicit BlockedContentTabHelper(content::WebContents* web_contents);
-  static int kUserDataKey;
   friend class WebContentsUserData<BlockedContentTabHelper>;
 
   // Called when the blocked popup notification is shown or hidden.
   void PopupNotificationVisibilityChanged(bool visible);
 
   // Called to notify any observers that |contents| is entering or leaving
   // the blocked state.
   void SendNotification(content::WebContents* contents, bool blocked_state);
 
   // Object that holds any blocked WebContentses spawned from this WebContents.
   scoped_ptr<BlockedContentContainer> blocked_contents_;
 
   // Should we block all child TabContents this attempts to spawn.
   bool all_contents_blocked_;
 
   // Delegate for notifying our owner (usually Browser) about stuff. Not owned
   // by us.
   BlockedContentTabHelperDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(BlockedContentTabHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_BLOCKED_CONTENT_BLOCKED_CONTENT_TAB_HELPER_H_