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

cc/resources/raster_worker_pool.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_RESOURCES_RASTER_WORKER_POOL_H_
 #define CC_RESOURCES_RASTER_WORKER_POOL_H_
 
 #include <deque>
 #include <vector>
 
@@ skipping 32 matching lines @@
 };
 
 class CC_EXPORT RasterWorkerPoolTask
     : public base::RefCounted<RasterWorkerPoolTask> {
  public:
   // Returns true if |buffer| was written to. False indicate that
   // the content of |buffer| is undefined and the resource doesn't
   // need to be initialized.
   virtual bool RunOnWorkerThread(unsigned thread_index,
                                  void* buffer,
-                                 const gfx::Size& size,
+                                 gfx::Size size,
                                  int stride) = 0;
   virtual void RunOnOriginThread(ResourceProvider* resource_provider,
                                  ContextProvider* context_provider) = 0;
   virtual void CompleteOnOriginThread() = 0;
 
   void DidRun(bool was_canceled);
   bool HasFinishedRunning() const;
   bool WasCanceled() const;
   void WillComplete();
   void DidComplete();
@@ skipping 252 matching lines @@
 
   scoped_refptr<internal::WorkerPoolTask> raster_finished_task_;
   scoped_refptr<internal::WorkerPoolTask>
       raster_required_for_activation_finished_task_;
   base::WeakPtrFactory<RasterWorkerPool> weak_ptr_factory_;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RASTER_WORKER_POOL_H_