Update thread annotiation macros in rtc_base to use RTC_ prefix

webrtc/rtc_base/event_tracer.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.
  */
 #include "webrtc/rtc_base/event_tracer.h"
@@ skipping 302 matching lines @@
                                  : kTraceArgBufferLength - 1;
       // This will hopefully be very close to nop. On most implementations, it
       // just writes null byte and sets the length field of the string.
       output.resize(output_length);
     }
 
     return output;
   }
 
   rtc::CriticalSection crit_;
-  std::vector<TraceEvent> trace_events_ GUARDED_BY(crit_);
+  std::vector<TraceEvent> trace_events_ RTC_GUARDED_BY(crit_);
   rtc::PlatformThread logging_thread_;
   rtc::Event shutdown_event_;
   rtc::ThreadChecker thread_checker_;
   FILE* output_file_ = nullptr;
   bool output_file_owned_ = false;
 };
 
 static void EventTracingThreadFunc(void* params) {
   static_cast<EventLogger*>(params)->Log();
 }
@@ skipping 71 matching lines @@
   RTC_DCHECK(old_logger);
   RTC_CHECK(rtc::AtomicOps::CompareAndSwapPtr(
                 &g_event_logger, old_logger,
                 static_cast<EventLogger*>(nullptr)) == old_logger);
   delete old_logger;
   webrtc::SetupEventTracer(nullptr, nullptr);
 }
 
 }  // namespace tracing
 }  // namespace rtc