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

cc/test/fake_picture_layer_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_LAYER_IMPL_H_
 #define CC_TEST_FAKE_PICTURE_LAYER_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/layers/picture_layer_impl.h"
 
 namespace cc {
 
 class FakePictureLayerImpl : public PictureLayerImpl {
  public:
   static scoped_ptr<FakePictureLayerImpl> Create(
       LayerTreeImpl* tree_impl, int id) {
     return make_scoped_ptr(new FakePictureLayerImpl(tree_impl, id));
   }
 
   static scoped_ptr<FakePictureLayerImpl> CreateWithPile(
       LayerTreeImpl* tree_impl, int id, scoped_refptr<PicturePileImpl> pile) {
     return make_scoped_ptr(new FakePictureLayerImpl(tree_impl, id, pile));
   }
 
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
       OVERRIDE;
   virtual void AppendQuads(QuadSink* quad_sink,
                            AppendQuadsData* append_quads_data) OVERRIDE;
-  virtual gfx::Size CalculateTileSize(
-      const gfx::Size& content_bounds) const OVERRIDE;
+  virtual gfx::Size CalculateTileSize(gfx::Size content_bounds) const OVERRIDE;
 
   using PictureLayerImpl::AddTiling;
   using PictureLayerImpl::CleanUpTilingsOnActiveLayer;
   using PictureLayerImpl::CanHaveTilings;
   using PictureLayerImpl::MarkVisibleResourcesAsRequired;
   using PictureLayerImpl::DoPostCommitInitializationIfNeeded;
   using PictureLayerImpl::MinimumContentsScale;
 
   bool needs_post_commit_initialization() const {
     return needs_post_commit_initialization_;
   }
 
   bool is_using_lcd_text() const { return is_using_lcd_text_; }
   void force_set_lcd_text(bool enabled) { is_using_lcd_text_ = enabled; }
 
   PictureLayerTiling* HighResTiling() const;
   PictureLayerTiling* LowResTiling() const;
   size_t num_tilings() const { return tilings_->num_tilings(); }
 
   PictureLayerImpl* twin_layer() { return twin_layer_; }
   PictureLayerTilingSet* tilings() { return tilings_.get(); }
   PicturePileImpl* pile() { return pile_.get(); }
   size_t append_quads_count() { return append_quads_count_; }
 
   const Region& invalidation() const { return invalidation_; }
   void set_invalidation(const Region& region) { invalidation_ = region; }
 
-  void set_fixed_tile_size(const gfx::Size& size) { fixed_tile_size_ = size; }
+  void set_fixed_tile_size(gfx::Size size) { fixed_tile_size_ = size; }
 
   void CreateDefaultTilingsAndTiles();
   void SetAllTilesVisible();
   void SetAllTilesReady();
   void SetAllTilesReadyInTiling(PictureLayerTiling* tiling);
 
  protected:
   FakePictureLayerImpl(
       LayerTreeImpl* tree_impl,
       int id,
       scoped_refptr<PicturePileImpl> pile);
   FakePictureLayerImpl(LayerTreeImpl* tree_impl, int id);
 
  private:
   gfx::Size fixed_tile_size_;
 
   size_t append_quads_count_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_PICTURE_LAYER_IMPL_H_