Switch CriticalSectionWrapper->rtc::CriticalSection in modules/audio_coding.

webrtc/modules/audio_coding/codecs/isac/locked_bandwidth_info.cc

 /*
  *  Copyright (c) 2015 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.
  */
 
 #include "webrtc/modules/audio_coding/codecs/isac/locked_bandwidth_info.h"
 
 namespace webrtc {
 
-LockedIsacBandwidthInfo::LockedIsacBandwidthInfo()
-      : lock_(CriticalSectionWrapper::CreateCriticalSection()) {
+LockedIsacBandwidthInfo::LockedIsacBandwidthInfo() {
   bwinfo_.in_use = 0;
 }
 
 LockedIsacBandwidthInfo::~LockedIsacBandwidthInfo() = default;
 
 }  // namespace webrtc