Update thread annotiation macros in rtc_base to use RTC_ prefix

webrtc/rtc_base/criticalsection_unittest.cc

Index: webrtc/rtc_base/criticalsection_unittest.cc
diff --git a/webrtc/rtc_base/criticalsection_unittest.cc b/webrtc/rtc_base/criticalsection_unittest.cc
index 2e136bf80418a3837837caf0bd9ee0fb6bd7eaf9..c264e44bd7d3b2c0a05e4dd524c9e782e6188c0b 100644
--- a/webrtc/rtc_base/criticalsection_unittest.cc
+++ b/webrtc/rtc_base/criticalsection_unittest.cc
@@ -113,14 +113,10 @@ class RunnerBase : public MessageHandler {
   int shared_value_;
 };
 
-class LOCKABLE CriticalSectionLock {
+class RTC_LOCKABLE CriticalSectionLock {
  public:
-  void Lock() EXCLUSIVE_LOCK_FUNCTION() {
-    cs_.Enter();
-  }
-  void Unlock() UNLOCK_FUNCTION() {
-    cs_.Leave();
-  }
+  void Lock() RTC_EXCLUSIVE_LOCK_FUNCTION() { cs_.Enter(); }
+  void Unlock() RTC_UNLOCK_FUNCTION() { cs_.Leave(); }
 
  private:
   CriticalSection cs_;