Adding ThreadChecker validation to d'tors for host classes

remoting/host/chromeos/clipboard_aura.cc

 // Copyright 2014 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/chromeos/clipboard_aura.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 12 matching lines @@
 
 namespace remoting {
 
 ClipboardAura::ClipboardAura()
     : current_change_count_(0),
       polling_interval_(
           base::TimeDelta::FromMilliseconds(kClipboardPollingIntervalMs)) {
 }
 
 ClipboardAura::~ClipboardAura() {
+  DCHECK(thread_checker_.CalledOnValidThread());
 }
 
 void ClipboardAura::Start(
     std::unique_ptr<protocol::ClipboardStub> client_clipboard) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   client_clipboard_ = std::move(client_clipboard);
 
   // Aura doesn't provide a clipboard-changed notification. The only way to
   // detect clipboard changes is by polling.
@@ skipping 46 matching lines @@
   event.set_data(data);
 
   client_clipboard_->InjectClipboardEvent(event);
 }
 
 std::unique_ptr<Clipboard> Clipboard::Create() {
   return base::WrapUnique(new ClipboardAura());
 }
 
 }  // namespace remoting