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

cc/resources/resource_pool.h

 // 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.
 
 #ifndef CC_RESOURCES_RESOURCE_POOL_H_
 #define CC_RESOURCES_RESOURCE_POOL_H_
 
 #include <list>
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/renderer.h"
 #include "cc/resources/resource.h"
 #include "cc/resources/resource_format.h"
 
 namespace cc {
 class ScopedResource;
 
 class CC_EXPORT ResourcePool {
  public:
   static scoped_ptr<ResourcePool> Create(ResourceProvider* resource_provider,
                                          GLenum target,
                                          ResourceFormat format) {
     return make_scoped_ptr(new ResourcePool(resource_provider, target, format));
   }
 
   virtual ~ResourcePool();
 
-  scoped_ptr<ScopedResource> AcquireResource(const gfx::Size& size);
+  scoped_ptr<ScopedResource> AcquireResource(gfx::Size size);
   void ReleaseResource(scoped_ptr<ScopedResource>);
 
   void SetResourceUsageLimits(size_t max_memory_usage_bytes,
                               size_t max_unused_memory_usage_bytes,
                               size_t max_resource_count);
 
   void ReduceResourceUsage();
   void CheckBusyResources();
 
   size_t total_memory_usage_bytes() const { return memory_usage_bytes_; }
@@ skipping 27 matching lines @@
   typedef std::list<ScopedResource*> ResourceList;
   ResourceList unused_resources_;
   ResourceList busy_resources_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourcePool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_POOL_H_