Standardize usage of virtual/override/final in content/renderer/

content/renderer/media/video_source_handler.cc

 // Copyright (c) 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.
 
 #include "content/renderer/media/video_source_handler.h"
 
 #include <string>
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 15 matching lines @@
 // to video track to receive the captured frame.
 // It can be attached to a FrameReaderInterface to output the received frame.
 class PpFrameReceiver : public MediaStreamVideoSink {
  public:
   PpFrameReceiver(blink::WebMediaStreamTrack track)
     : track_(track),
       reader_(NULL),
       weak_factory_(this) {
   }
 
-  virtual ~PpFrameReceiver() {}
+  ~PpFrameReceiver() override {}
 
   void SetReader(FrameReaderInterface* reader) {
     if (reader) {
       DCHECK(!reader_);
       MediaStreamVideoSink::AddToVideoTrack(
           this,
           media::BindToCurrentLoop(
               base::Bind(
                   &PpFrameReceiver::OnVideoFrame,
                   weak_factory_.GetWeakPtr())),
@@ skipping 103 matching lines @@
     FrameReaderInterface* reader)
     : receiver_(new PpFrameReceiver(blink_track)) {
   receiver_->SetReader(reader);
 }
 
 VideoSourceHandler::SourceInfo::~SourceInfo() {
   receiver_->SetReader(NULL);
 }
 
 }  // namespace content