Make cricket::VideoFrame inherit webrtc::VideoFrame.

webrtc/media/base/mediachannel.h

Index: webrtc/media/base/mediachannel.h
diff --git a/webrtc/media/base/mediachannel.h b/webrtc/media/base/mediachannel.h
index 1355b36679012475ba39e118484f80b07c81a0a3..a2738dfec28bd8bd0134f76f3f465d047f6671e9 100644
--- a/webrtc/media/base/mediachannel.h
+++ b/webrtc/media/base/mediachannel.h
@@ -31,6 +31,7 @@
 #include "webrtc/media/base/codec.h"
 #include "webrtc/media/base/mediaconstants.h"
 #include "webrtc/media/base/streamparams.h"
+#include "webrtc/media/base/videoframe.h"
 #include "webrtc/media/base/videosinkinterface.h"
 #include "webrtc/media/base/videosourceinterface.h"
 // TODO(juberti): re-evaluate this include
@@ -50,7 +51,11 @@ namespace cricket {
 class AudioSource;
 class ScreencastId;
 class VideoCapturer;
+// TODO(nisse): For some reason, forward declaration doens't work when
+// the definition is a "using" alias.
+#if 0
 class VideoFrame;
+#endif
 struct RtpHeader;
 struct VideoFormat;