Update from https://crrev.com/320343

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 <list>
 #include <vector>
 
@@ skipping 43 matching lines @@
   std::vector<ReleaseCallbackImpl> release_callbacks;
 
   // TODO(danakj): Remove these too.
   std::vector<unsigned> software_resources;
   ReleaseCallbackImpl software_release_callback;
 
   VideoFrameExternalResources();
   ~VideoFrameExternalResources();
 };
 
-// VideoResourceUpdater is by the video system to produce frame content as
+// 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> {
  public:
-  explicit VideoResourceUpdater(ContextProvider* context_provider,
-                                ResourceProvider* resource_provider);
+  VideoResourceUpdater(ContextProvider* context_provider,
+                       ResourceProvider* resource_provider);
   ~VideoResourceUpdater();
 
   VideoFrameExternalResources CreateExternalResourcesFromVideoFrame(
       const scoped_refptr<media::VideoFrame>& video_frame);
 
  private:
   struct PlaneResource {
     unsigned resource_id;
     gfx::Size resource_size;
     ResourceFormat resource_format;
@@ skipping 55 matching lines @@
   // Recycle resources so that we can reduce the number of allocations and
   // data transfers.
   ResourceList all_resources_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoResourceUpdater);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_VIDEO_RESOURCE_UPDATER_H_