Change includes of gfx/* to ui/gfx/*

ui/gfx/canvas.h

 // Copyright (c) 2010 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_CANVAS_H_
 #define UI_GFX_CANVAS_H_
 #pragma once
 
 #include <string>
 
 #include "base/string16.h"
-#include "gfx/native_widget_types.h"
 // TODO(beng): remove this include when we no longer depend on SkTypes.
 #include "skia/ext/platform_canvas.h"
+#include "ui/gfx/native_widget_types.h"
 
 namespace gfx {
 
 class Brush;
 class CanvasSkia;
 class Font;
 class Point;
 class Rect;
 
 // TODO(beng): documentation.
@@ skipping 204 matching lines @@
   // Returns the rectangle that is invalid.
   virtual gfx::Rect GetInvalidRect() const = 0;
 
   // Returns the underlying Canvas.
   virtual Canvas* AsCanvas() = 0;
 };
 
 }  // namespace gfx;
 
 #endif  // UI_GFX_CANVAS_H_