Simplify SSRC usage inside ViEEncoder.

webrtc/build/sanitizers/tsan_suppressions_webrtc.cc

 /*
  *  Copyright (c) 2014 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 @@
 "race:user_sctp_timer_iterate\n"
 
 // https://code.google.com/p/webrtc/issues/detail?id=5151
 "race:sctp_close\n"
 
 // Potential deadlocks detected after roll in r6516.
 // https://code.google.com/p/webrtc/issues/detail?id=3509
 "deadlock:webrtc::RTCPReceiver::SetSsrcs\n"
 "deadlock:webrtc::test::UdpSocketManagerPosixImpl::RemoveSocket\n"
 "deadlock:webrtc::vcm::VideoReceiver::RegisterPacketRequestCallback\n"
-"deadlock:webrtc::ViEEncoder::OnLocalSsrcChanged\n"
 
 // TODO(pbos): Trace events are racy due to lack of proper POD atomics.
 // https://code.google.com/p/webrtc/issues/detail?id=2497
 "race:*trace_event_unique_catstatic*\n"
 
 // https://code.google.com/p/webrtc/issues/detail?id=4719
 "race:webrtc::voe::TransmitMixer::PrepareDemux\n"
 "race:webrtc::voe::TransmitMixer::EnableStereoChannelSwapping\n"
 
 // Race between InitCpuFlags and TestCpuFlag in libyuv.
 // https://code.google.com/p/libyuv/issues/detail?id=508
 "race:InitCpuFlags\n"
 
 // https://bugs.chromium.org/p/webrtc/issues/detail?id=5524
 "race:AudioChannelTest_SendSrtpToSrtpOnThread_Test::TestBody\n"
 "race:VideoChannelTest_SendSrtpToSrtpOnThread_Test::TestBody\n"
 "race:DataChannelTest_SendSrtpToSrtpOnThread_Test::TestBody\n"
 
 // End of suppressions.
 ;  // Please keep this semicolon.
 
 #endif  // THREAD_SANITIZER