Update thread annotiation macros in rtc_base to use RTC_ prefix

webrtc/rtc_base/signalthread.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 101 matching lines @@
     ~Worker() override;
     void Run() override;
     bool IsProcessingMessages() override;
 
    private:
     SignalThread* parent_;
 
     RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(Worker);
   };
 
-  class SCOPED_LOCKABLE EnterExit {
+  class RTC_SCOPED_LOCKABLE EnterExit {
    public:
-    explicit EnterExit(SignalThread* t) EXCLUSIVE_LOCK_FUNCTION(t->cs_)
+    explicit EnterExit(SignalThread* t) RTC_EXCLUSIVE_LOCK_FUNCTION(t->cs_)
         : t_(t) {
       t_->cs_.Enter();
       // If refcount_ is zero then the object has already been deleted and we
       // will be double-deleting it in ~EnterExit()! (shouldn't happen)
       RTC_DCHECK_NE(0, t_->refcount_);
       ++t_->refcount_;
     }
-    ~EnterExit() UNLOCK_FUNCTION() {
+    ~EnterExit() RTC_UNLOCK_FUNCTION() {
       bool d = (0 == --t_->refcount_);
       t_->cs_.Leave();
       if (d)
         delete t_;
     }
 
    private:
     SignalThread* t_;
 
     RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(EnterExit);
   };
 
   void Run();
   void OnMainThreadDestroyed();
 
   Thread* main_;
   Worker worker_;
   CriticalSection cs_;
   State state_;
   int refcount_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(SignalThread);
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 }  // namespace rtc
 
 #endif  // WEBRTC_RTC_BASE_SIGNALTHREAD_H_