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

cc/layers/delegated_renderer_layer.cc

 // Copyright 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.
 
 #include "cc/layers/delegated_renderer_layer.h"
 
 #include "cc/layers/delegated_renderer_layer_impl.h"
 #include "cc/output/delegated_frame_data.h"
 #include "cc/quads/render_pass_draw_quad.h"
 #include "cc/trees/blocking_task_runner.h"
@@ skipping 68 matching lines @@
 }
 
 void DelegatedRendererLayer::ProviderHasNewFrame() {
   should_collect_new_frame_ = true;
   SetNeedsUpdate();
   // The active frame needs to be replaced and resources returned before the
   // commit is called complete.
   SetNextCommitWaitsForActivation();
 }
 
-void DelegatedRendererLayer::SetDisplaySize(const gfx::Size& size) {
+void DelegatedRendererLayer::SetDisplaySize(gfx::Size size) {
   if (display_size_ == size)
     return;
   display_size_ = size;
   SetNeedsCommit();
 }
 
 static bool FrameDataRequiresFilterContext(const DelegatedFrameData* frame) {
   for (size_t i = 0; i < frame->render_pass_list.size(); ++i) {
     const QuadList& quad_list = frame->render_pass_list[i]->quad_list;
     for (size_t j = 0; j < quad_list.size(); ++j) {
@@ skipping 25 matching lines @@
   // If any quad has a filter operation or a blend mode other than normal,
   // then we need an offscreen context to draw this layer's content.
   if (FrameDataRequiresFilterContext(frame_data_))
     layer_tree_host()->set_needs_filter_context();
 
   SetNeedsPushProperties();
   return true;
 }
 
 }  // namespace cc