cc: Shrink size of display item

cc/playback/display_item_proto_factory.h

 // Copyright 2015 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_PLAYBACK_DISPLAY_ITEM_PROTO_FACTORY_H_
 #define CC_PLAYBACK_DISPLAY_ITEM_PROTO_FACTORY_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "cc/playback/display_item.h"
 #include "cc/playback/display_item_list.h"
 
 namespace cc {
 
 namespace proto {
 class DisplayItem;
 }
 
 class DisplayItemProtoFactory {
  public:
-  static DisplayItem* AllocateAndConstruct(const gfx::Rect& visual_rect,
-                                           DisplayItemList* list,
-                                           const proto::DisplayItem& proto);
+  static void AllocateAndConstruct(const gfx::Rect& visual_rect,
+                                   DisplayItemList* list,
+                                   const proto::DisplayItem& proto);
 
  private:
   DisplayItemProtoFactory() {}
   virtual ~DisplayItemProtoFactory() {}
 
   DISALLOW_COPY_AND_ASSIGN(DisplayItemProtoFactory);
 };
 
 }  // namespace cc
 
 #endif  // CC_PLAYBACK_DISPLAY_ITEM_PROTO_FACTORY_H_