Revert of New static method I420Buffer::SetToBlack.

webrtc/media/engine/webrtcvideoframe.h

 /*
  *  Copyright (c) 2011 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 45 matching lines @@
 
   // The timestamp of the captured frame is expected to use the same
   // timescale and epoch as rtc::Time.
   // TODO(nisse): Consider adding a warning message, or even an RTC_DCHECK, if
   // the time is too far off.
   bool Init(const CapturedFrame* frame, int dw, int dh, bool apply_rotation);
 
   void InitToEmptyBuffer(int w, int h);
   void InitToEmptyBuffer(int w, int h, int64_t time_stamp_ns);
 
+  bool InitToBlack(int w, int h, int64_t time_stamp_ns);
+
   int width() const override;
   int height() const override;
 
   const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& video_frame_buffer()
       const override;
 
   /* System monotonic clock */
   int64_t timestamp_us() const override { return timestamp_us_; }
   void set_timestamp_us(int64_t time_us) override { timestamp_us_ = time_us; };
 
@@ skipping 38 matching lines @@
   webrtc::VideoRotation rotation_;
 
   // This is mutable as the calculation is expensive but once calculated, it
   // remains const.
   mutable std::unique_ptr<VideoFrame> rotated_frame_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOFRAME_H_