Update thread annotiation macros to use RTC_ prefix

webrtc/call/bitrate_estimator_tests.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 <functional>
@@ skipping 65 matching lines @@
     bool Wait() { return done_.Wait(test::CallTest::kDefaultTimeoutMs); }
 
     void PushExpectedLogLine(const std::string& expected_log_line) {
       rtc::CritScope lock(&crit_sect_);
       expected_log_lines_.push_back(expected_log_line);
     }
 
    private:
     typedef std::list<std::string> Strings;
     rtc::CriticalSection crit_sect_;
-    Strings received_log_lines_ GUARDED_BY(crit_sect_);
-    Strings expected_log_lines_ GUARDED_BY(crit_sect_);
+    Strings received_log_lines_ RTC_GUARDED_BY(crit_sect_);
+    Strings expected_log_lines_ RTC_GUARDED_BY(crit_sect_);
     rtc::Event done_;
   };
 
   Callback callback_;
 };
 }  // namespace
 
 static const int kTOFExtensionId = 4;
 static const int kASTExtensionId = 5;
 
@@ skipping 217 matching lines @@
     receiver_log_.PushExpectedLogLine(kAbsSendTimeLog);
     receiver_log_.PushExpectedLogLine(
         "WrappingBitrateEstimator: Switching to transmission time offset RBE.");
     streams_.push_back(new Stream(this));
     streams_[0]->StopSending();
     streams_[1]->StopSending();
   });
   EXPECT_TRUE(receiver_log_.Wait());
 }
 }  // namespace webrtc