Adds a gfx_export.h to ui/gfx and converts all code in ui/gfx to

ui/gfx/sys_color_change_listener.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_GFX_SYS_COLOR_CHANGE_LISTENER_H_
 #define UI_GFX_SYS_COLOR_CHANGE_LISTENER_H_
 
 #include "base/basictypes.h"
 #include "third_party/skia/include/core/SkColor.h"
-#include "ui/base/ui_export.h"
+#include "ui/gfx/gfx_export.h"
 
 namespace gfx {
 
 // Returns true only if Chrome should use an inverted color scheme - which is
 // only true if the system has high-contrast mode enabled and and is using a
 // light-on-dark color scheme. To be notified when this status changes, use
 // ScopedSysColorChangeListener, below.
 UI_EXPORT bool IsInvertedColorScheme();
 
 // Interface for classes that want to listen to system color changes.
@@ skipping 14 matching lines @@
 
  private:
   SysColorChangeListener* listener_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedSysColorChangeListener);
 };
 
 }  // namespace gfx;
 
 #endif  // UI_GFX_SYS_COLOR_CHANGE_LISTENER_H_