Update thread annotiation macros in modules to use RTC_ prefix

webrtc/modules/rtp_rtcp/source/playout_delay_oracle.h

Index: webrtc/modules/rtp_rtcp/source/playout_delay_oracle.h
diff --git a/webrtc/modules/rtp_rtcp/source/playout_delay_oracle.h b/webrtc/modules/rtp_rtcp/source/playout_delay_oracle.h
index 26a616509d033a3563147a3777805c8182fbd158..b0d734bf29e44ade199719361c024eaa1cc58218 100644
--- a/webrtc/modules/rtp_rtcp/source/playout_delay_oracle.h
+++ b/webrtc/modules/rtp_rtcp/source/playout_delay_oracle.h
@@ -63,15 +63,15 @@ class PlayoutDelayOracle {
   // Guards access to data across multiple threads.
   rtc::CriticalSection crit_sect_;
   // The current highest sequence number on which playout delay has been sent.
-  int64_t high_sequence_number_ GUARDED_BY(crit_sect_);
+  int64_t high_sequence_number_ RTC_GUARDED_BY(crit_sect_);
   // Indicates whether the playout delay should go on the next frame.
-  bool send_playout_delay_ GUARDED_BY(crit_sect_);
+  bool send_playout_delay_ RTC_GUARDED_BY(crit_sect_);
   // Sender ssrc.
-  uint32_t ssrc_ GUARDED_BY(crit_sect_);
+  uint32_t ssrc_ RTC_GUARDED_BY(crit_sect_);
   // Sequence number unwrapper.
-  SequenceNumberUnwrapper unwrapper_ GUARDED_BY(crit_sect_);
+  SequenceNumberUnwrapper unwrapper_ RTC_GUARDED_BY(crit_sect_);
   // Playout delay values on the next frame if |send_playout_delay_| is set.
-  PlayoutDelay playout_delay_ GUARDED_BY(crit_sect_);
+  PlayoutDelay playout_delay_ RTC_GUARDED_BY(crit_sect_);
 
   RTC_DISALLOW_COPY_AND_ASSIGN(PlayoutDelayOracle);
 };