Add RTC_ prefix to (D)CHECKs and related macros.

webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc

 /*
  *  Copyright (c) 2012 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 457 matching lines @@
 
   // Store new.
   packet_overhead_ = packet_overhead;
 
   uint16_t length =
       rtp_sender_.MaxPayloadLength() - packet_over_head_diff;
   return rtp_sender_.SetMaxPayloadLength(length, packet_overhead_);
 }
 
 int32_t ModuleRtpRtcpImpl::SetMaxTransferUnit(const uint16_t mtu) {
-  DCHECK_LE(mtu, IP_PACKET_SIZE) << "Invalid mtu: " << mtu;
+  RTC_DCHECK_LE(mtu, IP_PACKET_SIZE) << "Invalid mtu: " << mtu;
   return rtp_sender_.SetMaxPayloadLength(mtu - packet_overhead_,
                                          packet_overhead_);
 }
 
 RTCPMethod ModuleRtpRtcpImpl::RTCP() const {
   if (rtcp_sender_.Status() != kRtcpOff) {
     return rtcp_receiver_.Status();
   }
   return kRtcpOff;
 }
@@ skipping 504 matching lines @@
 void ModuleRtpRtcpImpl::RegisterSendChannelRtpStatisticsCallback(
     StreamDataCountersCallback* callback) {
   rtp_sender_.RegisterRtpStatisticsCallback(callback);
 }
 
 StreamDataCountersCallback*
     ModuleRtpRtcpImpl::GetSendChannelRtpStatisticsCallback() const {
   return rtp_sender_.GetRtpStatisticsCallback();
 }
 }  // namespace webrtc