Enable -Winconsistent-missing-override flag.

webrtc/media/engine/webrtcvideocapturer.h

 /*
  *  Copyright (c) 2004 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 43 matching lines @@
   bool GetBestCaptureFormat(const VideoFormat& desired,
                             VideoFormat* best_format) override;
   CaptureState Start(const VideoFormat& capture_format) override;
   void Stop() override;
   bool IsRunning() override;
   bool IsScreencast() const override { return false; }
 
  protected:
   void OnSinkWantsChanged(const rtc::VideoSinkWants& wants) override;
   // Override virtual methods of the parent class VideoCapturer.
-  virtual bool GetPreferredFourccs(std::vector<uint32_t>* fourccs);
+  bool GetPreferredFourccs(std::vector<uint32_t>* fourccs) override;
 
  private:
   // Callback when a frame is captured by camera.
-  virtual void OnIncomingCapturedFrame(const int32_t id,
-                                       const webrtc::VideoFrame& frame);
-  virtual void OnCaptureDelayChanged(const int32_t id,
-                                     const int32_t delay);
+  void OnIncomingCapturedFrame(const int32_t id,
+                               const webrtc::VideoFrame& frame) override;
+  void OnCaptureDelayChanged(const int32_t id,
+                             const int32_t delay) override;
 
   // Used to signal captured frames on the same thread as invoked Start().
   // With WebRTC's current VideoCapturer implementations, this will mean a
   // thread hop, but in other implementations (e.g. Chrome) it will be called
   // directly from OnIncomingCapturedFrame.
   // TODO(tommi): Remove this workaround when we've updated the WebRTC capturers
   // to follow the same contract.
   void SignalFrameCapturedOnStartThread(const webrtc::VideoFrame& frame);
 
   std::unique_ptr<WebRtcVcmFactoryInterface> factory_;
   rtc::scoped_refptr<webrtc::VideoCaptureModule> module_;
   int captured_frames_;
   std::vector<uint8_t> capture_buffer_;
   rtc::Thread* start_thread_;  // Set in Start(), unset in Stop();
 
   std::unique_ptr<rtc::AsyncInvoker> async_invoker_;
 };
 
 struct WebRtcCapturedFrame : public CapturedFrame {
  public:
   WebRtcCapturedFrame(const webrtc::VideoFrame& frame,
                       void* buffer,
                       size_t length);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_WEBRTC_WEBRTCVIDEOCAPTURER_H_