Adding ThreadChecker validation to d'tors for protocol classes

remoting/protocol/webrtc_audio_source_adapter.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/protocol/webrtc_audio_source_adapter.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 41 matching lines @@
   base::ObserverList<webrtc::AudioTrackSinkInterface> audio_sinks_;
   base::Lock audio_sinks_lock_;
 
   base::ThreadChecker thread_checker_;
 };
 
 WebrtcAudioSourceAdapter::Core::Core() {
   thread_checker_.DetachFromThread();
 }
 
-WebrtcAudioSourceAdapter::Core::~Core() {}
+WebrtcAudioSourceAdapter::Core::~Core() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
 
 void WebrtcAudioSourceAdapter::Core::Start(
     std::unique_ptr<AudioSource> audio_source) {
   DCHECK(thread_checker_.CalledOnValidThread());
   audio_source_ = std::move(audio_source);
   audio_source_->Start(
       base::Bind(&Core::OnAudioPacket, base::Unretained(this)));
 }
 
 void WebrtcAudioSourceAdapter::Core::Pause(bool pause) {
@@ skipping 113 matching lines @@
   core_->RemoveSink(sink);
 }
 
 void WebrtcAudioSourceAdapter::RegisterObserver(
     webrtc::ObserverInterface* observer) {}
 void WebrtcAudioSourceAdapter::UnregisterObserver(
     webrtc::ObserverInterface* observer) {}
 
 }  // namespace protocol
 }  // namespace remoting