Make HWNDMessageHandler subclass WindowImpl.

chrome/browser/ui/views/frame/browser_frame_win.h

Index: chrome/browser/ui/views/frame/browser_frame_win.h
===================================================================
--- chrome/browser/ui/views/frame/browser_frame_win.h	(revision 153552)
+++ chrome/browser/ui/views/frame/browser_frame_win.h	(working copy)
@@ -47,11 +47,15 @@
   virtual int GetInitialShowState() const OVERRIDE;
   virtual bool GetClientAreaInsets(gfx::Insets* insets) const OVERRIDE;
   virtual void UpdateFrameAfterFrameChange() OVERRIDE;
-  virtual void OnEndSession(BOOL ending, UINT logoff) OVERRIDE;
-  virtual void OnInitMenuPopup(HMENU menu,
-                               UINT position,
-                               BOOL is_system_menu) OVERRIDE;
-  virtual void OnWindowPosChanged(WINDOWPOS* window_pos) OVERRIDE;
+  virtual void HandleEndSession() OVERRIDE;
+  virtual void HandleInitMenuPopup() OVERRIDE;
+  virtual void HandleVisibilityChanged(bool visible) OVERRIDE;
+  virtual void HandleFrameChanged() OVERRIDE;
+  virtual bool HandleMSG(UINT message,
+                         WPARAM w_param,
+                         LPARAM l_param,
+                         LRESULT* result) OVERRIDE;
+
   virtual void OnScreenReaderDetected() OVERRIDE;
   virtual bool ShouldUseNativeFrame() const OVERRIDE;
   virtual void Show() OVERRIDE;
@@ -59,7 +63,7 @@
       const gfx::Rect& restored_bounds) OVERRIDE;
   virtual void ShowWithWindowState(ui::WindowShowState show_state) OVERRIDE;
   virtual void Close() OVERRIDE;
-  virtual void OnActivate(UINT action, BOOL minimized, HWND window) OVERRIDE;
+  virtual void HandleActivationChanged(bool active) OVERRIDE;
   virtual void FrameTypeChanged() OVERRIDE;
   virtual void SetFullscreen(bool fullscreen) OVERRIDE;
 
@@ -74,11 +78,6 @@
   virtual void ButtonPressed(views::Button* sender,
                              const ui::Event& event) OVERRIDE;
 
-  // Overridden from WindowImpl:
-  virtual LRESULT OnWndProc(UINT message,
-                            WPARAM w_param,
-                            LPARAM l_param) OVERRIDE;
-
  private:
   // Updates the DWM with the frame bounds.
   void UpdateDWMFrame();