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

cc/output/copy_output_request.cc

 // 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.
 
 #include "cc/output/copy_output_request.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/logging.h"
 #include "cc/output/copy_output_result.h"
@@ skipping 37 matching lines @@
 
 void CopyOutputRequest::SendEmptyResult() {
   SendResult(CopyOutputResult::CreateEmptyResult().Pass());
 }
 
 void CopyOutputRequest::SendBitmapResult(scoped_ptr<SkBitmap> bitmap) {
   SendResult(CopyOutputResult::CreateBitmapResult(bitmap.Pass()).Pass());
 }
 
 void CopyOutputRequest::SendTextureResult(
-    const gfx::Size& size,
+    gfx::Size size,
     const TextureMailbox& texture_mailbox,
     scoped_ptr<SingleReleaseCallback> release_callback) {
   DCHECK(texture_mailbox.IsTexture());
   SendResult(CopyOutputResult::CreateTextureResult(
       size, texture_mailbox, release_callback.Pass()));
 }
 
 void CopyOutputRequest::SetTextureMailbox(
     const TextureMailbox& texture_mailbox) {
   DCHECK(!force_bitmap_result_);
   DCHECK(texture_mailbox.IsTexture());
   has_texture_mailbox_ = true;
   texture_mailbox_ = texture_mailbox;
 }
 
 }  // namespace cc