Delete unused VideoCapturer statistics.

talk/app/webrtc/objc/avfoundationvideocapturer.h

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 17 matching lines @@
 #ifndef TALK_APP_WEBRTC_OBJC_AVFOUNDATION_VIDEO_CAPTURER_H_
 #define TALK_APP_WEBRTC_OBJC_AVFOUNDATION_VIDEO_CAPTURER_H_
 
 #include "webrtc/media/base/videocapturer.h"
 #include "webrtc/video_frame.h"
 
 #import <AVFoundation/AVFoundation.h>
 
 @class RTCAVFoundationVideoCapturerInternal;
 
+namespace rtc {
+class Thread;
+} // namespace rtc
+
 namespace webrtc {
 
 class AVFoundationVideoCapturer : public cricket::VideoCapturer {
  public:
   AVFoundationVideoCapturer();
   ~AVFoundationVideoCapturer();
 
   cricket::CaptureState Start(const cricket::VideoFormat& format) override;
   void Stop() override;
   bool IsRunning() override;
@@ skipping 24 matching lines @@
   // Used to signal frame capture on the thread that capturer was started on.
   void SignalFrameCapturedOnStartThread(const cricket::CapturedFrame* frame);
 
   RTCAVFoundationVideoCapturerInternal* _capturer;
   rtc::Thread* _startThread;  // Set in Start(), unset in Stop().
 };  // AVFoundationVideoCapturer
 
 }  // namespace webrtc
 
 #endif  // TALK_APP_WEBRTC_OBJC_AVFOUNDATION_CAPTURER_H_