Make using WebContentsUserData simpler.

chrome/browser/ui/search/search_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_SEARCH_SEARCH_TAB_HELPER_H_
 #define CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_
 
 #include "base/basictypes.h"
 #include "chrome/browser/common/web_contents_user_data.h"
 #include "chrome/browser/ui/search/search_model.h"
@@ skipping 42 matching lines @@
       int64 frame_id,
       content::RenderViewHost* render_view_host) OVERRIDE;
 
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
  private:
   explicit SearchTabHelper(content::WebContents* web_contents);
-  static int kUserDataKey;
   friend class WebContentsUserData<SearchTabHelper>;
 
   // Enum of the load states for the NTP.
   //
   // Once the user loads the NTP the |ntp_load_state_| changes to
   // WAITING_FOR_FRAME_ID and the search::mode::Type changes to
   // MODE_NTP_LOADING. The |ntp_load_state_| progresses through the remaining
   // states and when done search::mode::Type is changed to MODE_NTP.
   //
   // This code is intended to avoid a flash between white (default background
@@ skipping 44 matching lines @@
   // See description above NTPLoadState.
   int64 main_frame_id_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchTabHelper);
 };
 
 }  // namespace search
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_