Revert of New static method I420Buffer::SetToBlack.

webrtc/media/base/videoframe.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 73 matching lines @@
                                bool interpolate,
                                bool crop) const;
 
   // Writes the frame into the target VideoFrame, stretched to the size of that
   // frame. The parameter "interpolate" controls whether to interpolate or just
   // take the nearest-point. The parameter "crop" controls whether to crop this
   // frame to the aspect ratio of the target frame before stretching.
   virtual void StretchToFrame(VideoFrame *target, bool interpolate,
                               bool crop) const;
 
+  // Sets the video frame to black.
+  virtual bool SetToBlack();
+
   // Tests if sample is valid.  Returns true if valid.
   static bool Validate(uint32_t fourcc,
                        int w,
                        int h,
                        const uint8_t* sample,
                        size_t sample_size);
 
  protected:
   // Writes the frame into the given planes, stretched to the given width and
   // height. The parameter "interpolate" controls whether to interpolate or just
@@ skipping 10 matching lines @@
   virtual VideoFrame* CreateEmptyFrame(int w,
                                        int h,
                                        int64_t timestamp_us) const = 0;
 
   virtual void set_rotation(webrtc::VideoRotation rotation) = 0;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_BASE_VIDEOFRAME_H_