Cast: Added missing DCHECKs to ThreadChecker calls and minor cleanup.

media/cast/video_receiver/video_receiver.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/cast/video_receiver/video_receiver.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 85 matching lines @@
   RtpReceiver* rtp_receiver_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(LocalRtpReceiverStatistics);
 };
 
 VideoReceiver::VideoReceiver(scoped_refptr<CastEnvironment> cast_environment,
                              const VideoReceiverConfig& video_config,
                              transport::PacedPacketSender* const packet_sender)
     : cast_environment_(cast_environment),
       event_subscriber_(
-          cast_environment->GetMessageSingleThreadTaskRunnerForThread(
-              CastEnvironment::MAIN),
           kMaxEventSubscriberEntries,
           ReceiverRtcpEventSubscriber::kVideoEventSubscriber),
       codec_(video_config.codec),
       target_delay_delta_(
           base::TimeDelta::FromMilliseconds(video_config.rtp_max_delay_ms)),
       frame_delay_(base::TimeDelta::FromMilliseconds(
           1000 / video_config.max_frame_rate)),
       incoming_payload_callback_(new LocalRtpVideoData(this)),
       incoming_payload_feedback_(new LocalRtpVideoFeedback(this)),
       rtp_receiver_(cast_environment_->Clock(),
@@ skipping 406 matching lines @@
 }
 
 void VideoReceiver::SendNextRtcpReport() {
   DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
   rtcp_->SendRtcpFromRtpReceiver(NULL, NULL);
   ScheduleNextRtcpReport();
 }
 
 }  // namespace cast
 }  // namespace media