Delete unused file webrtcvideochannelfactory.h.

webrtc/media/engine/webrtcvideochannelfactory.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.
- */
-
-#ifndef WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOCHANNELFACTORY_H_
-#define WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOCHANNELFACTORY_H_
-
-namespace cricket {
-class VoiceMediaChannel;
-class WebRtcVideoEngine2;
-class WebRtcVideoChannel2;
-
-class WebRtcVideoChannelFactory {
- public:
-  virtual ~WebRtcVideoChannelFactory() {}
-  virtual WebRtcVideoChannel2* Create(WebRtcVideoEngine2* engine,
-                                      VoiceMediaChannel* voice_channel) = 0;
-};
-}  // namespace cricket
-
-#endif  // WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOCHANNELFACTORY_H_