Update thread annotiation macros to use RTC_ prefix

webrtc/rtc_tools/network_tester/test_controller.h

 /*
  *  Copyright 2017 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 49 matching lines @@
                     const char* data,
                     size_t len,
                     const rtc::SocketAddress& remote_addr,
                     const rtc::PacketTime& packet_time);
   rtc::ThreadChecker test_controller_thread_checker_;
   rtc::SequencedTaskChecker packet_sender_checker_;
   rtc::BasicPacketSocketFactory socket_factory_;
   const std::string config_file_path_;
   PacketLogger packet_logger_;
   rtc::CriticalSection local_test_done_lock_;
-  bool local_test_done_ GUARDED_BY(local_test_done_lock_);
+  bool local_test_done_ RTC_GUARDED_BY(local_test_done_lock_);
   bool remote_test_done_;
   std::array<char, kEthernetMtu> send_data_;
   std::unique_ptr<cricket::UdpTransport> udp_transport_;
   std::unique_ptr<PacketSender> packet_sender_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(TestController);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_RTC_TOOLS_NETWORK_TESTER_TEST_CONTROLLER_H_