Adding ThreadChecker validation to d'tors for protocol classes

remoting/protocol/webrtc_transport.cc

 // Copyright 2015 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_transport.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 281 matching lines @@
       transport_context_->port_allocator_factory()->CreatePortAllocator(
           transport_context_);
 
   // Takes ownership of video_encoder_factory_.
   peer_connection_wrapper_.reset(new PeerConnectionWrapper(
       worker_thread, base::WrapUnique(video_encoder_factory_),
       std::move(port_allocator), weak_factory_.GetWeakPtr()));
 }
 
 WebrtcTransport::~WebrtcTransport() {
+  DCHECK(thread_checker_.CalledOnValidThread());
   Close(OK);
 }
 
 webrtc::PeerConnectionInterface* WebrtcTransport::peer_connection() {
   return peer_connection_wrapper_ ? peer_connection_wrapper_->peer_connection()
                                   : nullptr;
 }
 
 webrtc::PeerConnectionFactoryInterface*
 WebrtcTransport::peer_connection_factory() {
@@ skipping 410 matching lines @@
   // the stack and so it must be destroyed later.
   base::ThreadTaskRunnerHandle::Get()->DeleteSoon(
       FROM_HERE, peer_connection_wrapper_.release());
 
   if (error != OK)
     event_handler_->OnWebrtcTransportError(error);
 }
 
 }  // namespace protocol
 }  // namespace remoting