Adding ThreadChecker validation to d'tors for host classes

remoting/host/gcd_state_updater.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/host/gcd_state_updater.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 26 matching lines @@
   DCHECK(signal_strategy_);
   DCHECK(thread_checker_.CalledOnValidThread());
 
   signal_strategy_->AddListener(this);
 
   // Update state if the |signal_strategy_| is already connected.
   OnSignalStrategyStateChange(signal_strategy_->GetState());
 }
 
 GcdStateUpdater::~GcdStateUpdater() {
+  DCHECK(thread_checker_.CalledOnValidThread());
   signal_strategy_->RemoveListener(this);
 }
 
 void GcdStateUpdater::SetHostOfflineReason(
     const std::string& host_offline_reason,
     const base::TimeDelta& timeout,
     const base::Callback<void(bool success)>& ack_callback) {
   // TODO(jrw): Implement this.  Refer to
   // HeartbeatSender::SetHostOfflineReason.
   NOTIMPLEMENTED();
@@ skipping 64 matching lines @@
   base_state->SetString("_hostVersion", STRINGIZE(VERSION));
   patch->Set("base", std::move(base_state));
 
   // Send the update to GCD.
   gcd_rest_client_->PatchState(
       std::move(patch),
       base::Bind(&GcdStateUpdater::OnPatchStateResult, base::Unretained(this)));
 }
 
 }  // namespace remoting