Delete unused file screencastid.h.

webrtc/media/base/mediachannel.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 33 matching lines @@
 class Timing;
 }
 
 namespace webrtc {
 class AudioSinkInterface;
 }
 
 namespace cricket {
 
 class AudioSource;
-class ScreencastId;
 class VideoCapturer;
 struct RtpHeader;
 struct VideoFormat;
 
 const int kScreencastDefaultFps = 5;
 
 template <class T>
 static std::string ToStringIfSet(const char* key, const rtc::Optional<T>& val) {
   std::string str;
   if (val) {
@@ skipping 1069 matching lines @@
   // Signal when the media channel is ready to send the stream. Arguments are:
   //     writable(bool)
   sigslot::signal1<bool> SignalReadyToSend;
   // Signal for notifying that the remote side has closed the DataChannel.
   sigslot::signal1<uint32_t> SignalStreamClosedRemotely;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_BASE_MEDIACHANNEL_H_