Recreate WebrtcVideoSendStream if screen content setting is changed.

webrtc/video/video_send_stream.h

 /*
  *  Copyright (c) 2013 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 86 matching lines @@
  private:
   class ConstructionTask;
   class DestructAndGetRtpStateTask;
 
   rtc::ThreadChecker thread_checker_;
   rtc::TaskQueue* const worker_queue_;
   rtc::Event thread_sync_event_;
 
   SendStatisticsProxy stats_proxy_;
   const VideoSendStream::Config config_;
+  const VideoEncoderConfig::ContentType content_type_;
   std::unique_ptr<VideoSendStreamImpl> send_stream_;
   std::unique_ptr<ViEEncoder> vie_encoder_;
 };
 
 }  // namespace internal
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_VIDEO_SEND_STREAM_H_