Make HWNDMessageHandler subclass WindowImpl.

chrome/browser/ui/views/native_constrained_window_win.cc

Index: chrome/browser/ui/views/native_constrained_window_win.cc
===================================================================
--- chrome/browser/ui/views/native_constrained_window_win.cc	(revision 153552)
+++ chrome/browser/ui/views/native_constrained_window_win.cc	(working copy)
@@ -30,16 +30,13 @@
   }
 
   // Overridden from views::NativeWidgetWin:
-  virtual void OnFinalMessage(HWND window) OVERRIDE {
+  virtual void HandleDestroyed() OVERRIDE {
     delegate_->OnNativeConstrainedWindowDestroyed();
-    NativeWidgetWin::OnFinalMessage(window);
+    NativeWidgetWin::HandleDestroyed();
   }
-  virtual LRESULT OnMouseActivate(UINT message,
-                                  WPARAM w_param,
-                                  LPARAM l_param) OVERRIDE {
-    if (IsNonClientHitTestCode(static_cast<UINT>(LOWORD(l_param))))
+  virtual void HandleMouseActivate(int hittest_code) OVERRIDE {
+    if (IsNonClientHitTestCode(hittest_code))
       delegate_->OnNativeConstrainedWindowMouseActivate();
-    return NativeWidgetWin::OnMouseActivate(message, w_param, l_param);
   }
 
   NativeConstrainedWindowDelegate* delegate_;