Adding locking to webrtc::voe::Channel to fix race conditions

webrtc/voice_engine/voe_video_sync_impl.cc

 /*
  *  Copyright (c) 2012 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 200 matching lines @@
     _shared->SetLastError(VE_NOT_INITED, kTraceError);
     return -1;
   }
   voe::ChannelOwner ch = _shared->channel_manager().GetChannel(channel);
   voe::Channel* channel_ptr = ch.channel();
   if (channel_ptr == NULL) {
     _shared->SetLastError(VE_CHANNEL_NOT_VALID, kTraceError,
                           "GetLeastRequiredDelayMs() failed to locate channel");
     return -1;
   }
-  return channel_ptr->least_required_delay_ms();
+  return channel_ptr->LeastRequiredDelayMs();
 }
 
 #endif  // #ifdef WEBRTC_VOICE_ENGINE_VIDEO_SYNC_API
 
 }  // namespace webrtc