Update thread annotiation macros in modules to use RTC_ prefix

webrtc/modules/rtp_rtcp/source/rtp_header_parser.cc

 /*
  *  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.
  */
 #include "webrtc/modules/rtp_rtcp/include/rtp_header_parser.h"
@@ skipping 12 matching lines @@
   bool Parse(const uint8_t* packet,
              size_t length,
              RTPHeader* header) const override;
 
   bool RegisterRtpHeaderExtension(RTPExtensionType type, uint8_t id) override;
 
   bool DeregisterRtpHeaderExtension(RTPExtensionType type) override;
 
  private:
   rtc::CriticalSection critical_section_;
-  RtpHeaderExtensionMap rtp_header_extension_map_ GUARDED_BY(critical_section_);
+  RtpHeaderExtensionMap rtp_header_extension_map_
+      RTC_GUARDED_BY(critical_section_);
 };
 
 RtpHeaderParser* RtpHeaderParser::Create() {
   return new RtpHeaderParserImpl;
 }
 
 RtpHeaderParserImpl::RtpHeaderParserImpl() {}
 
 bool RtpHeaderParser::IsRtcp(const uint8_t* packet, size_t length) {
   RtpUtility::RtpHeaderParser rtp_parser(packet, length);
@@ skipping 23 matching lines @@
                                                      uint8_t id) {
   rtc::CritScope cs(&critical_section_);
   return rtp_header_extension_map_.RegisterByType(id, type);
 }
 
 bool RtpHeaderParserImpl::DeregisterRtpHeaderExtension(RTPExtensionType type) {
   rtc::CritScope cs(&critical_section_);
   return rtp_header_extension_map_.Deregister(type) == 0;
 }
 }  // namespace webrtc