Use base::WindowImpl instead of CWindowImpl to reduce dependencies on ATL....

base/window_impl.h

 // Copyright (c) 2009 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 BASE_WINDOW_IMPL_H_
 #define BASE_WINDOW_IMPL_H_
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <atlmisc.h>
@@ skipping 13 matching lines @@
 //  A convenience class that encapsulates the details of creating and
 //  destroying a HWND.  This class also hosts the windows procedure used by all
 //  Windows.
 //
 ///////////////////////////////////////////////////////////////////////////////
 class WindowImpl {
  public:
   WindowImpl();
   virtual ~WindowImpl();
 
-  BEGIN_MSG_MAP_EX(WidgetWin)
+  BEGIN_MSG_MAP_EX(WindowImpl)
     // No messages to handle
   END_MSG_MAP()
 
   // Initialize the Window with a parent and an initial desired size.
   virtual void Init(HWND parent, const gfx::Rect& bounds);
 
   // Returns the gfx::NativeView associated with this Window.
   virtual gfx::NativeView GetNativeView() const;
 
   // Retrieves the default window icon to use for windows if none is specified.
@@ skipping 50 matching lines @@
 
   // Our hwnd.
   HWND hwnd_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowImpl);
 };
 
 }  // namespace base
 
 #endif  // BASE_WINDOW_IMPL_H_