Make using WebContentsUserData simpler.

chrome/browser/printing/print_view_manager.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_PRINTING_PRINT_VIEW_MANAGER_H_
 #define CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/string16.h"
 #include "chrome/browser/api/prefs/pref_member.h"
@@ skipping 82 matching lines @@
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // Terminates or cancels the print job if one was pending.
   virtual void RenderViewGone(base::TerminationStatus status) OVERRIDE;
 
   // Cancels the print job.
   virtual void StopNavigation() OVERRIDE;
 
  private:
   explicit PrintViewManager(content::WebContents* web_contents);
-  static int kUserDataKey;
   friend class WebContentsUserData<PrintViewManager>;
 
   enum PrintPreviewState {
     NOT_PREVIEWING,
     USER_INITIATED_PREVIEW,
     SCRIPTED_PREVIEW,
   };
 
   // IPC Message handlers.
   void OnDidGetPrintedPagesCount(int cookie, int number_pages);
@@ skipping 99 matching lines @@
 
   // Whether our content is in blocked state.
   bool tab_content_blocked_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintViewManager);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_H_