Get rid of the 1-pixel client inset hack.

ui/views/win/hwnd_message_handler.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 UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 
 #include <windows.h>
 #include <atlbase.h>
 #include <atlapp.h>
@@ skipping 234 matching lines @@
   // or subsequently.
   void ClientAreaSizeChanged();
 
   // Returns the insets of the client area relative to the non-client area of
   // the window.
   bool GetClientAreaInsets(gfx::Insets* insets) const;
 
   // Resets the window region for the current widget bounds if necessary.
   // If |force| is true, the window region is reset to NULL even for native
   // frame windows.
-  void ResetWindowRegion(bool force);
+  void ResetWindowRegion(bool force, bool redraw);
 
   // Calls DefWindowProc, safely wrapping the call in a ScopedRedrawLock to
   // prevent frame flicker. DefWindowProc handling can otherwise render the
   // classic-look window title bar directly.
   LRESULT DefWindowProcWithRedrawLock(UINT message,
                                       WPARAM w_param,
                                       LPARAM l_param);
 
   // Notifies any owned windows that we're closing.
   void NotifyOwnedWindowsParentClosing();
@@ skipping 255 matching lines @@
 
   // Generates touch-ids for touch-events.
   ui::SequentialIDGenerator id_generator_;
 
   DISALLOW_COPY_AND_ASSIGN(HWNDMessageHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_