Remove thread check from PacketRouter::SendFeedback.

webrtc/modules/pacing/packet_router.cc

 /*
  *  Copyright (c) 2015 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 105 matching lines @@
     // operation was successful - otherwise we need to retry. Saving the
     // return value saves us a load on retry.
     prev_seq = rtc::AtomicOps::CompareAndSwap(&transport_seq_, desired_prev_seq,
                                               new_seq);
   } while (prev_seq != desired_prev_seq);
 
   return new_seq;
 }
 
 bool PacketRouter::SendFeedback(rtcp::TransportFeedback* packet) {
-  RTC_DCHECK(pacer_thread_checker_.CalledOnValidThread());
   rtc::CritScope cs(&modules_crit_);
   if (::webrtc::SendFeedback(packet, &recv_rtp_modules_))
     return true;
   if (::webrtc::SendFeedback(packet, &send_rtp_modules_))
     return true;
   return false;
 }
 
 }  // namespace webrtc