Update thread annotiation macros to use RTC_ prefix

webrtc/video/send_delay_stats.h

Index: webrtc/video/send_delay_stats.h
diff --git a/webrtc/video/send_delay_stats.h b/webrtc/video/send_delay_stats.h
index 5d8538eb5dd59cd5949ce6f4c357af3d30cd5d6f..230fa9d649bec68b54569eebb39930ffa7322786 100644
--- a/webrtc/video/send_delay_stats.h
+++ b/webrtc/video/send_delay_stats.h
@@ -64,22 +64,22 @@ class SendDelayStats : public SendPacketObserver {
 
   void UpdateHistograms();
   void RemoveOld(int64_t now, PacketMap* packets)
-      EXCLUSIVE_LOCKS_REQUIRED(crit_);
+      RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_);
   AvgCounter* GetSendDelayCounter(uint32_t ssrc)
-      EXCLUSIVE_LOCKS_REQUIRED(crit_);
+      RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_);
 
   Clock* const clock_;
   rtc::CriticalSection crit_;
 
-  PacketMap packets_ GUARDED_BY(crit_);
-  size_t num_old_packets_ GUARDED_BY(crit_);
-  size_t num_skipped_packets_ GUARDED_BY(crit_);
+  PacketMap packets_ RTC_GUARDED_BY(crit_);
+  size_t num_old_packets_ RTC_GUARDED_BY(crit_);
+  size_t num_skipped_packets_ RTC_GUARDED_BY(crit_);
 
-  std::set<uint32_t> ssrcs_ GUARDED_BY(crit_);
+  std::set<uint32_t> ssrcs_ RTC_GUARDED_BY(crit_);
 
   // Mapped by SSRC.
   std::map<uint32_t, std::unique_ptr<AvgCounter>> send_delay_counters_
-      GUARDED_BY(crit_);
+      RTC_GUARDED_BY(crit_);
 };
 
 }  // namespace webrtc