Move WindowImpl to gfx so I can use it there for canvas unit tests....

gfx/window_impl.cc

 // 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.
 
-#include "app/win/window_impl.h"
+#include "gfx/window_impl.h"
 
 #include <list>
 
 #include "base/singleton.h"
 #include "base/string_util.h"
 #include "base/win_util.h"
 
-namespace app {
+namespace gfx {
 
 static const DWORD kWindowDefaultChildStyle =
     WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN | WS_CLIPSIBLINGS;
 static const DWORD kWindowDefaultStyle = WS_OVERLAPPEDWINDOW;
 static const DWORD kWindowDefaultExStyle = 0;
 
 ///////////////////////////////////////////////////////////////////////////////
 // WindowImpl class tracking.
 
 // Several external scripts rely explicitly on this base class name for
@@ skipping 192 matching lines @@
   class_ex.lpszClassName = name.c_str();
   class_ex.hIconSm = class_ex.hIcon;
   ATOM atom = RegisterClassEx(&class_ex);
   DCHECK(atom);
 
   Singleton<ClassRegistrar>()->RegisterClass(class_info, name, atom);
 
   return name;
 }
 
-}  // namespace app
+}  // namespace gfx