Attempt 2 at:...

views/widget/widget_win.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 VIEWS_WIDGET_WIDGET_WIN_H_
 #define VIEWS_WIDGET_WIDGET_WIN_H_
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <atlcrack.h>
@@ skipping 166 matching lines @@
     MSG_WM_WINDOWPOSCHANGING(OnWindowPosChanging)
     MSG_WM_WINDOWPOSCHANGED(OnWindowPosChanged)
   END_MSG_MAP()
 
   // Overridden from Widget:
   virtual void Init(gfx::NativeView parent, const gfx::Rect& bounds);
   virtual void SetContentsView(View* view);
   virtual void GetBounds(gfx::Rect* out, bool including_frame) const;
   virtual void SetBounds(const gfx::Rect& bounds);
   virtual void MoveAbove(Widget* other);
-  virtual void SetShape(const gfx::Path& shape);
+  virtual void SetShape(gfx::NativeRegion region);
   virtual void Close();
   virtual void CloseNow();
   virtual void Show();
   virtual void Hide();
   virtual gfx::NativeView GetNativeView() const;
   virtual void PaintNow(const gfx::Rect& update_rect);
   virtual void SetOpacity(unsigned char opacity);
   virtual void SetAlwaysOnTop(bool on_top);
   virtual RootView* GetRootView();
   virtual Widget* GetRootWidget() const;
@@ skipping 338 matching lines @@
 
   // Instance of accessibility information and handling for MSAA root
   ScopedComPtr<IAccessible> accessibility_root_;
 
   scoped_ptr<DefaultThemeProvider> default_theme_provider_;
 };
 
 }  // namespace views
 
 #endif  // VIEWS_WIDGET_WIDGET_WIN_H_