Revert of New static method I420Buffer::SetToBlack.

webrtc/media/engine/webrtcvideoframe.cc

Index: webrtc/media/engine/webrtcvideoframe.cc
diff --git a/webrtc/media/engine/webrtcvideoframe.cc b/webrtc/media/engine/webrtcvideoframe.cc
index 4f89c8b85d100562d14cb891c6b11e8f67f247d1..3ca6db12d02e3a95032bba41d6e0020d9e4cf0db 100644
--- a/webrtc/media/engine/webrtcvideoframe.cc
+++ b/webrtc/media/engine/webrtcvideoframe.cc
@@ -63,6 +63,12 @@
                static_cast<uint8_t*>(frame->data), frame->data_size,
                frame->time_stamp / rtc::kNumNanosecsPerMicrosec,
                frame->rotation, apply_rotation);
+}
+
+bool WebRtcVideoFrame::InitToBlack(int w, int h,
+                                   int64_t time_stamp_ns) {
+  InitToEmptyBuffer(w, h, time_stamp_ns);
+  return SetToBlack();
 }
 
 int WebRtcVideoFrame::width() const {