Cleanup: Update the path to gfx size headers.

ui/gfx/win/dpi.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_DPI_WIN_H_
 #define UI_GFX_DPI_WIN_H_
 
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/geometry/size.h"
 #include "ui/gfx/gfx_export.h"
-#include "ui/gfx/size.h"
 
 namespace gfx {
 
 // Initialization of the scale factor that should be applied for rendering
 // in this process. Must be called before attempts to call any of the getter
 // methods below in this file, e.g. in the early toolkit/resource bundle setup.
 // This can be called multiple times during various tests, but subsequent calls
 // have no effect.
 GFX_EXPORT void InitDeviceScaleFactor(float scale);
 
@@ skipping 20 matching lines @@
 GFX_EXPORT Size DIPToScreenSize(const Size& dip_size);
 
 // Win32's GetSystemMetrics uses pixel measures. This function calls
 // GetSystemMetrics for the given |metric|, then converts the result to DIP.
 GFX_EXPORT int GetSystemMetricsInDIP(int metric);
 
 }  // namespace win
 }  // namespace gfx
 
 #endif  // UI_GFX_DPI_WIN_H_