Replace deprecated base::NonThreadSafe in media/audio in favor of SequenceChecker.

media/audio/sounds/sounds_manager.h

 // Copyright 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 MEDIA_AUDIO_SOUNDS_SOUNDS_MANAGER_H_
 #define MEDIA_AUDIO_SOUNDS_SOUNDS_MANAGER_H_
 
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
+#include "base/sequence_checker.h"
 #include "base/strings/string_piece.h"
-#include "base/threading/non_thread_safe.h"
 #include "base/time/time.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 // This class is used for reproduction of system sounds. All methods
 // should be accessed from the Audio thread.
-class MEDIA_EXPORT SoundsManager : public base::NonThreadSafe {
+class MEDIA_EXPORT SoundsManager {
  public:
   typedef int SoundKey;
 
   // Creates a singleton instance of the SoundsManager.
   static void Create();
 
   // Removes a singleton instance of the SoundsManager.
   static void Shutdown();
 
   // Returns a pointer to a singleton instance of the SoundsManager.
@@ skipping 18 matching lines @@
 
   // Returns duration of the sound identified by |key|. If SoundsManager
   // was not properly initialized or |key| was not registered, this
   // method returns an empty value.
   virtual base::TimeDelta GetDuration(SoundKey key) = 0;
 
  protected:
   SoundsManager();
   virtual ~SoundsManager();
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(SoundsManager);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_SOUNDS_SOUNDS_MANAGER_H_