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

media/audio/alsa/alsa_output.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.
 //
 // Creates an output stream based on the ALSA PCM interface.
 //
 // On device write failure, the stream will move itself to an invalid state.
 // No more data will be pulled from the data source, or written to the device.
 // All calls to public API functions will either no-op themselves, or return an
 // error if possible.  Specifically, If the stream is in an error state, Open()
@@ skipping 14 matching lines @@
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "base/sequence_checker.h"
 #include "base/single_thread_task_runner.h"
-#include "base/threading/non_thread_safe.h"
 #include "base/time/tick_clock.h"
 #include "base/time/time.h"
 #include "media/audio/audio_io.h"
 #include "media/base/audio_parameters.h"
 
 namespace media {
 
 class AlsaWrapper;
 class AudioManagerBase;
 class ChannelMixer;
 class SeekableBuffer;
 
-class MEDIA_EXPORT AlsaPcmOutputStream : public AudioOutputStream,
-                                         public base::NonThreadSafe {
+class MEDIA_EXPORT AlsaPcmOutputStream : public AudioOutputStream {
  public:
   // String for the generic "default" ALSA device that has the highest
   // compatibility and chance of working.
   static const char kDefaultDevice[];
 
   // Pass this to the AlsaPcmOutputStream if you want to attempt auto-selection
   // of the audio device.
   static const char kAutoSelectDevice[];
 
   // Prefix for device names to enable ALSA library resampling.
@@ skipping 146 matching lines @@
 
   // Container for retrieving data from AudioSourceCallback::OnMoreData().
   std::unique_ptr<AudioBus> audio_bus_;
 
   // Channel mixer and temporary bus for the final mixed channel data.
   std::unique_ptr<ChannelMixer> channel_mixer_;
   std::unique_ptr<AudioBus> mixed_audio_bus_;
 
   std::unique_ptr<base::TickClock> tick_clock_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   // Allows us to run tasks on the AlsaPcmOutputStream instance which are
   // bound by its lifetime.
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<AlsaPcmOutputStream> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AlsaPcmOutputStream);
 };
 
 MEDIA_EXPORT std::ostream& operator<<(std::ostream& os,
                                       AlsaPcmOutputStream::InternalState);
 
 };  // namespace media
 
 #endif  // MEDIA_AUDIO_ALSA_ALSA_OUTPUT_H_