Update thread annotiation macros in rtc_base to use RTC_ prefix

webrtc/rtc_base/swap_queue.h

Index: webrtc/rtc_base/swap_queue.h
diff --git a/webrtc/rtc_base/swap_queue.h b/webrtc/rtc_base/swap_queue.h
index 3519686af996c81be3473a6ef16e57fc2ba3177c..95bae21bb8654c423c1399fbe7736bf8764e2100 100644
--- a/webrtc/rtc_base/swap_queue.h
+++ b/webrtc/rtc_base/swap_queue.h
@@ -192,16 +192,16 @@ class SwapQueue {
 
   // TODO(peah): Change this to use std::function() once we can use C++11 std
   // lib.
-  QueueItemVerifier queue_item_verifier_ GUARDED_BY(crit_queue_);
+  QueueItemVerifier queue_item_verifier_ RTC_GUARDED_BY(crit_queue_);
 
   // (next_read_index_ + num_elements_) % queue_.size() =
   //  next_write_index_
-  size_t next_write_index_ GUARDED_BY(crit_queue_) = 0;
-  size_t next_read_index_ GUARDED_BY(crit_queue_) = 0;
-  size_t num_elements_ GUARDED_BY(crit_queue_) = 0;
+  size_t next_write_index_ RTC_GUARDED_BY(crit_queue_) = 0;
+  size_t next_read_index_ RTC_GUARDED_BY(crit_queue_) = 0;
+  size_t num_elements_ RTC_GUARDED_BY(crit_queue_) = 0;
 
   // queue_.size() is constant.
-  std::vector<T> queue_ GUARDED_BY(crit_queue_);
+  std::vector<T> queue_ RTC_GUARDED_BY(crit_queue_);
 
   RTC_DISALLOW_COPY_AND_ASSIGN(SwapQueue);
 };