Standardize usage of virtual/override/final in content/

content/test/test_video_frame_provider.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 CONTENT_TEST_TEST_VIDEO_FRAME_PROVIDER_H_
 #define CONTENT_TEST_TEST_VIDEO_FRAME_PROVIDER_H_
 
 #include "base/time/time.h"
 #include "content/renderer/media/video_frame_provider.h"
 #include "ui/gfx/size.h"
@@ skipping 11 matching lines @@
 // only non-black pixels.
 class TestVideoFrameProvider : public VideoFrameProvider {
  public:
   TestVideoFrameProvider(
       const gfx::Size& size,
       const base::TimeDelta& frame_duration,
       const base::Closure& error_cb,
       const RepaintCB& repaint_cb);
 
   // VideoFrameProvider implementation.
-  virtual void Start() override;
-  virtual void Stop() override;
-  virtual void Play() override;
-  virtual void Pause() override;
+  void Start() override;
+  void Stop() override;
+  void Play() override;
+  void Pause() override;
 
  protected:
-  virtual ~TestVideoFrameProvider();
+  ~TestVideoFrameProvider() override;
 
  private:
   enum State {
     kStarted,
     kPaused,
     kStopped,
   };
 
   void GenerateFrame();
 
   scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
   gfx::Size size_;
   State state_;
 
   base::TimeDelta current_time_;
   base::TimeDelta frame_duration_;
   base::Closure error_cb_;
   RepaintCB repaint_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(TestVideoFrameProvider);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_VIDEO_FRAME_PROVIDER_H_