Update thread annotiation macros to use RTC_ prefix

webrtc/voice_engine/audio_level.h

Index: webrtc/voice_engine/audio_level.h
diff --git a/webrtc/voice_engine/audio_level.h b/webrtc/voice_engine/audio_level.h
index d69365afb6ee460bf4d6bcc1d32a5d0664803148..33f8fe2d51474d195f466c1eed12897cbdf94624 100644
--- a/webrtc/voice_engine/audio_level.h
+++ b/webrtc/voice_engine/audio_level.h
@@ -45,13 +45,13 @@ class AudioLevel {
 
   rtc::CriticalSection crit_sect_;
 
-  int16_t abs_max_ GUARDED_BY(crit_sect_);
-  int16_t count_ GUARDED_BY(crit_sect_);
-  int8_t current_level_ GUARDED_BY(crit_sect_);
-  int16_t current_level_full_range_ GUARDED_BY(crit_sect_);
+  int16_t abs_max_ RTC_GUARDED_BY(crit_sect_);
+  int16_t count_ RTC_GUARDED_BY(crit_sect_);
+  int8_t current_level_ RTC_GUARDED_BY(crit_sect_);
+  int16_t current_level_full_range_ RTC_GUARDED_BY(crit_sect_);
 
-  double total_energy_ GUARDED_BY(crit_sect_) = 0.0;
-  double total_duration_ GUARDED_BY(crit_sect_) = 0.0;
+  double total_energy_ RTC_GUARDED_BY(crit_sect_) = 0.0;
+  double total_duration_ RTC_GUARDED_BY(crit_sect_) = 0.0;
 };
 
 }  // namespace voe