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

content/renderer/media/rtc_dtmf_sender_handler.h

 // 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.
 
 #ifndef CONTENT_RENDERER_MEDIA_RTC_DTMF_SENDER_HANDLER_H_
 #define CONTENT_RENDERER_MEDIA_RTC_DTMF_SENDER_HANDLER_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebRTCDTMFSenderHandler.h"
 #include "third_party/WebKit/public/platform/WebRTCDTMFSenderHandlerClient.h"
 #include "third_party/webrtc/api/dtmfsenderinterface.h"
 
 namespace content {
 
 // RtcDtmfSenderHandler is a delegate for the RTC DTMF Sender API messages
 // going between WebKit and native DTMF Sender in libjingle.
 // Instances of this class are owned by WebKit.
 // WebKit call all of these methods on the main render thread.
 // Callbacks to the webrtc::DtmfSenderObserverInterface implementation also
 // occur on the main render thread.
 class CONTENT_EXPORT RtcDtmfSenderHandler
-    : NON_EXPORTED_BASE(public blink::WebRTCDTMFSenderHandler),
-      NON_EXPORTED_BASE(public base::NonThreadSafe) {
+    : NON_EXPORTED_BASE(public blink::WebRTCDTMFSenderHandler) {
  public:
   explicit RtcDtmfSenderHandler(webrtc::DtmfSenderInterface* dtmf_sender);
   ~RtcDtmfSenderHandler() override;
 
   // blink::WebRTCDTMFSenderHandler implementation.
   void SetClient(blink::WebRTCDTMFSenderHandlerClient* client) override;
   blink::WebString CurrentToneBuffer() override;
   bool CanInsertDTMF() override;
   bool InsertDTMF(const blink::WebString& tones,
                   long duration,
                   long interToneGap) override;
 
   void OnToneChange(const std::string& tone);
 
  private:
   scoped_refptr<webrtc::DtmfSenderInterface> dtmf_sender_;
   blink::WebRTCDTMFSenderHandlerClient* webkit_client_;
   class Observer;
   scoped_refptr<Observer> observer_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   // |weak_factory_| must be the last member.
   base::WeakPtrFactory<RtcDtmfSenderHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RtcDtmfSenderHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_RTC_DTMF_SENDER_HANDLER_H_
-