Cleanup: Update the path to gfx size headers.

ui/views/controls/scrollbar/base_scroll_bar_thumb.h

 // Copyright (c) 2011 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_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_THUMB_H_
 #define UI_VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_THUMB_H_
 
-#include "ui/gfx/size.h"
+#include "ui/gfx/geometry/size.h"
 #include "ui/views/controls/button/custom_button.h"
 #include "ui/views/controls/scrollbar/scroll_bar.h"
 #include "ui/views/view.h"
 
 namespace gfx {
 class Canvas;
 }
 
 namespace views {
 
@@ skipping 55 matching lines @@
 
   // The current state of the thumb button.
   CustomButton::ButtonState state_;
 
   DISALLOW_COPY_AND_ASSIGN(BaseScrollBarThumb);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_THUMB_H_