Cleanup: Update the path to gfx size headers.

ui/wm/core/image_grid.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_WM_CORE_IMAGE_GRID_H_
 #define UI_WM_CORE_IMAGE_GRID_H_
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_delegate.h"
 #include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/geometry/size.h"
 #include "ui/gfx/image/image_skia.h"
-#include "ui/gfx/size.h"
 #include "ui/wm/wm_export.h"
 
 namespace gfx {
 class Image;
 }  // namespace gfx
 
 namespace wm {
 
 // An ImageGrid is a 3x3 array of ui::Layers, each containing an image.
 //
@@ skipping 187 matching lines @@
   scoped_ptr<ImagePainter> bottom_left_painter_;
   scoped_ptr<ImagePainter> bottom_painter_;
   scoped_ptr<ImagePainter> bottom_right_painter_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageGrid);
 };
 
 }  // namespace wm
 
 #endif  // UI_WM_CORE_IMAGE_GRID_H_