Replace SupportsWeakPtr with WeakPtrFactory in VideoResourceUpdater

cc/resources/video_resource_updater.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_VIDEO_RESOURCE_UPDATER_H_
 #define CC_RESOURCES_VIDEO_RESOURCE_UPDATER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 52 matching lines @@
   float multiplier;
   uint32_t bits_per_channel;
 
   VideoFrameExternalResources();
   VideoFrameExternalResources(const VideoFrameExternalResources& other);
   ~VideoFrameExternalResources();
 };
 
 // VideoResourceUpdater is used by the video system to produce frame content as
 // resources consumable by the compositor.
-class CC_EXPORT VideoResourceUpdater
-    : public base::SupportsWeakPtr<VideoResourceUpdater> {
+class CC_EXPORT VideoResourceUpdater {
  public:
   VideoResourceUpdater(ContextProvider* context_provider,
                        ResourceProvider* resource_provider,
                        bool use_stream_video_draw_quad);
   ~VideoResourceUpdater();
 
   VideoFrameExternalResources CreateExternalResourcesFromVideoFrame(
       scoped_refptr<media::VideoFrame> video_frame);
 
 
@@ skipping 93 matching lines @@
   ContextProvider* context_provider_;
   ResourceProvider* resource_provider_;
   const bool use_stream_video_draw_quad_;
   std::unique_ptr<media::SkCanvasVideoRenderer> video_renderer_;
   std::vector<uint8_t> upload_pixels_;
 
   // Recycle resources so that we can reduce the number of allocations and
   // data transfers.
   ResourceList all_resources_;
 
+  base::WeakPtrFactory<VideoResourceUpdater> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(VideoResourceUpdater);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_VIDEO_RESOURCE_UPDATER_H_