Deprecate NonThreadSafe in content/renderer/media in favor of SequenceChecker.

content/renderer/media/rtc_dtmf_sender_handler.cc

 // Copyright (c) 2013 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 "content/renderer/media/rtc_dtmf_sender_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 39 matching lines @@
 RtcDtmfSenderHandler::RtcDtmfSenderHandler(DtmfSenderInterface* dtmf_sender)
     : dtmf_sender_(dtmf_sender),
       webkit_client_(NULL),
       weak_factory_(this) {
   DVLOG(1) << "::ctor";
   observer_ = new Observer(weak_factory_.GetWeakPtr());
   dtmf_sender_->RegisterObserver(observer_.get());
 }
 
 RtcDtmfSenderHandler::~RtcDtmfSenderHandler() {
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   DVLOG(1) << "::dtor";
   dtmf_sender_->UnregisterObserver();
   // Release |observer| before |weak_factory_| is destroyed.
   observer_ = NULL;
 }
 
 void RtcDtmfSenderHandler::SetClient(
     blink::WebRTCDTMFSenderHandlerClient* client) {
   webkit_client_ = client;
 }
@@ skipping 16 matching lines @@
 
 void RtcDtmfSenderHandler::OnToneChange(const std::string& tone) {
   if (!webkit_client_) {
     LOG(ERROR) << "WebRTCDTMFSenderHandlerClient not set.";
     return;
   }
   webkit_client_->DidPlayTone(blink::WebString::FromUTF8(tone));
 }
 
 }  // namespace content