Move VideoFrame and related declarations to webrtc/api/video.

webrtc/media/engine/webrtcvideoengine2.cc

Index: webrtc/media/engine/webrtcvideoengine2.cc
diff --git a/webrtc/media/engine/webrtcvideoengine2.cc b/webrtc/media/engine/webrtcvideoengine2.cc
index 335ee3a691aed1f66d1f4bc0e628d07e2618fca3..e0ce0d50df4e37cbf315a872e2fe243c9bde7fa6 100644
--- a/webrtc/media/engine/webrtcvideoengine2.cc
+++ b/webrtc/media/engine/webrtcvideoengine2.cc
@@ -16,6 +16,7 @@
 #include <string>
 #include <utility>
 
+#include "webrtc/api/video/i420_buffer.h"
 #include "webrtc/base/copyonwritebuffer.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/stringutils.h"
@@ -1681,7 +1682,7 @@ bool WebRtcVideoChannel2::WebRtcVideoSendStream::SetVideoSend(
       rtc::scoped_refptr<webrtc::I420Buffer> black_buffer(
           webrtc::I420Buffer::Create(last_frame_info_.width,
                                      last_frame_info_.height));
-      black_buffer->SetToBlack();
+      webrtc::I420Buffer::SetBlack(black_buffer);
 
       encoder_sink_->OnFrame(webrtc::VideoFrame(
           black_buffer, last_frame_info_.rotation, last_frame_timestamp_us_));