Adding ThreadChecker validation to d'tors for client classes

remoting/client/plugin/pepper_video_renderer_2d.cc

 // Copyright (c) 2012 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/client/plugin/pepper_video_renderer_2d.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 40 matching lines @@
   pp::ImageData buffer_;
 };
 
 }  // namespace
 
 PepperVideoRenderer2D::PepperVideoRenderer2D()
     : software_video_renderer_(this),
       callback_factory_(this),
       weak_factory_(this) {}
 
-PepperVideoRenderer2D::~PepperVideoRenderer2D() {}
+PepperVideoRenderer2D::~PepperVideoRenderer2D() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
 
 void PepperVideoRenderer2D::SetPepperContext(
     pp::Instance* instance,
     EventHandler* event_handler) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(!instance_);
   DCHECK(!event_handler_);
   DCHECK(instance);
   DCHECK(event_handler);
 
@@ skipping 144 matching lines @@
   flush_pending_ = false;
 
   // Call all callbacks for the frames we've just flushed.
   flushing_frames_done_callbacks_.clear();
 
   // Flush again if necessary.
   Flush();
 }
 
 }  // namespace remoting