Replaced ACCESS_ON alias with GUARDED_BY macros

webrtc/modules/rtp_rtcp/source/playout_delay_oracle.h

 /*
  *  Copyright (c) 2016 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 61 matching lines @@
   // The current highest sequence number on which playout delay has been sent.
   int64_t high_sequence_number_ GUARDED_BY(crit_sect_);
   // Indicates whether the playout delay should go on the next frame.
   bool send_playout_delay_ GUARDED_BY(crit_sect_);
   // Sender ssrc.
   uint32_t ssrc_ GUARDED_BY(crit_sect_);
 
   // Data in this section is accessed on the sending/encoder thread alone.
   rtc::ThreadChecker thread_checker_;
   // Sequence number unwrapper.
-  SequenceNumberUnwrapper unwrapper_ ACCESS_ON(thread_checker_);
+  SequenceNumberUnwrapper unwrapper_ GUARDED_BY(thread_checker_);
   // Min playout delay value on the next frame if |send_playout_delay_| is set.
-  int min_playout_delay_ms_ ACCESS_ON(thread_checker_);
+  int min_playout_delay_ms_ GUARDED_BY(thread_checker_);
   // Max playout delay value on the next frame if |send_playout_delay_| is set.
-  int max_playout_delay_ms_ ACCESS_ON(thread_checker_);
+  int max_playout_delay_ms_ GUARDED_BY(thread_checker_);
 
   RTC_DISALLOW_COPY_AND_ASSIGN(PlayoutDelayOracle);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_PLAYOUT_DELAY_ORACLE_H_