Revert of [#7] Pass gfx structs by const ref (gfx::Size)

cc/test/fake_picture_pile_impl.h

 // Copyright 2013 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 CC_TEST_FAKE_PICTURE_PILE_IMPL_H_
 #define CC_TEST_FAKE_PICTURE_PILE_IMPL_H_
 
 #include "base/memory/ref_counted.h"
 #include "cc/resources/picture_pile_impl.h"
 #include "cc/test/fake_content_layer_client.h"
 
 namespace cc {
 
 class FakePicturePileImpl : public PicturePileImpl {
  public:
   static scoped_refptr<FakePicturePileImpl> CreateFilledPile(
-      const gfx::Size& tile_size,
-      const gfx::Size& layer_bounds);
+      gfx::Size tile_size,
+      gfx::Size layer_bounds);
 
   static scoped_refptr<FakePicturePileImpl> CreateEmptyPile(
-      const gfx::Size& tile_size,
-      const gfx::Size& layer_bounds);
+      gfx::Size tile_size,
+      gfx::Size layer_bounds);
 
   static scoped_refptr<FakePicturePileImpl> CreatePileWithRecordedRegion(
-      const gfx::Size& tile_size,
-      const gfx::Size& layer_bounds,
+      gfx::Size tile_size,
+      gfx::Size layer_bounds,
       const Region& recorded_region);
 
   static scoped_refptr<FakePicturePileImpl> CreatePile();
 
   TilingData& tiling() { return tiling_; }
 
   void AddRecordingAt(int x, int y);
   void RemoveRecordingAt(int x, int y);
   void RerecordPile();
 
@@ skipping 35 matching lines @@
   FakePicturePileImpl();
   virtual ~FakePicturePileImpl();
 
   FakeContentLayerClient client_;
   SkPaint default_paint_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_PICTURE_PILE_IMPL_H_