Replace media::VideoCapture::VideoFrameBuffer with media::VideoFrame.

content/renderer/media/rtc_video_capturer.h

Index: content/renderer/media/rtc_video_capturer.h
diff --git a/content/renderer/media/rtc_video_capturer.h b/content/renderer/media/rtc_video_capturer.h
index 84d6c84d591d9fba26ec308e71a06f78703c0cc6..006efdf647f079fb48c8adad6e0c3ab0334f410d 100644
--- a/content/renderer/media/rtc_video_capturer.h
+++ b/content/renderer/media/rtc_video_capturer.h
@@ -41,8 +41,7 @@ class RtcVideoCapturer
 
  private:
   // Frame captured callback method.
-  virtual void OnFrameCaptured(
-      const media::VideoCapture::VideoFrameBuffer& frame);
+  virtual void OnFrameCaptured(const scoped_refptr<media::VideoFrame>& frame);
 
   // State change callback, must be called on same thread as Start is called.
   void OnStateChange(RtcVideoCaptureDelegate::CaptureState state);
@@ -50,7 +49,7 @@ class RtcVideoCapturer
   const bool is_screencast_;
   scoped_refptr<RtcVideoCaptureDelegate> delegate_;
   VideoCaptureState state_;
-  base::Time start_time_;
+  base::TimeDelta first_frame_timestamp_;
 
   DISALLOW_COPY_AND_ASSIGN(RtcVideoCapturer);
 };