Update thread annotiation macros in rtc_base to use RTC_ prefix

webrtc/rtc_base/sequenced_task_checker.h

Index: webrtc/rtc_base/sequenced_task_checker.h
diff --git a/webrtc/rtc_base/sequenced_task_checker.h b/webrtc/rtc_base/sequenced_task_checker.h
index 40b07f98e6c66ee9bed4363557d4e659a78022a3..35bd3cd4ae303f52fd83bec3b804db03f37e3f12 100644
--- a/webrtc/rtc_base/sequenced_task_checker.h
+++ b/webrtc/rtc_base/sequenced_task_checker.h
@@ -54,17 +54,18 @@ class SequencedTaskCheckerDoNothing {
 //
 // In Release mode, CalledOnValidThread will always return true.
 #if ENABLE_SEQUENCED_TASK_CHECKER
-class LOCKABLE SequencedTaskChecker : public SequencedTaskCheckerImpl {};
+class RTC_LOCKABLE SequencedTaskChecker : public SequencedTaskCheckerImpl {};
 #else
-class LOCKABLE SequencedTaskChecker : public SequencedTaskCheckerDoNothing {};
+class RTC_LOCKABLE SequencedTaskChecker : public SequencedTaskCheckerDoNothing {
+};
 #endif  // ENABLE_SEQUENCED_TASK_CHECKER_H_
 
 namespace internal {
-class SCOPED_LOCKABLE SequencedTaskCheckerScope {
+class RTC_SCOPED_LOCKABLE SequencedTaskCheckerScope {
  public:
   explicit SequencedTaskCheckerScope(const SequencedTaskChecker* checker)
-      EXCLUSIVE_LOCK_FUNCTION(checker);
-  ~SequencedTaskCheckerScope() UNLOCK_FUNCTION();
+      RTC_EXCLUSIVE_LOCK_FUNCTION(checker);
+  ~SequencedTaskCheckerScope() RTC_UNLOCK_FUNCTION();
 };
 
 }  // namespace internal