Make HWNDMessageHandler subclass WindowImpl.

chrome/browser/ui/views/external_tab_container_win.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_VIEWS_EXTERNAL_TAB_CONTAINER_WIN_H_
 #define CHROME_BROWSER_UI_VIEWS_EXTERNAL_TAB_CONTAINER_WIN_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 209 matching lines @@
   virtual void InfoBarContainerStateChanged(bool is_animating) OVERRIDE;
   virtual bool DrawInfoBarArrows(int* x) const OVERRIDE;
 
   // Overridden from BlockedContentTabHelperDelegate:
   virtual TabContents* GetConstrainingTabContents(TabContents* source) OVERRIDE;
 
  protected:
   virtual ~ExternalTabContainerWin();
 
   // Overridden from views::NativeWidgetWin:
-  virtual LRESULT OnCreate(LPCREATESTRUCT create_struct);
-  virtual void OnDestroy();
+  virtual void HandleCreate();
+  virtual void HandleDestroying();
   virtual void OnFinalMessage(HWND window);
 
   bool InitNavigationInfo(NavigationInfo* nav_info,
                           content::NavigationType nav_type,
                           int relative_offset);
   void Navigate(const GURL& url, const GURL& referrer);
 
   // Helper resource automation registration method, allowing registration of
   // pending RenderViewHosts.
   void RegisterRenderViewHostForAutomation(
@@ skipping 154 matching lines @@
     return false;
   }
 
   virtual void BeforeUnloadFired(content::WebContents* tab, bool proceed,
                                  bool* proceed_to_fire_unload) {
     NOTREACHED();
   }
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_EXTERNAL_TAB_CONTAINER_WIN_H_