Fixed AudioInputController muted state related tsan bug.

media/audio/audio_input_controller.h

 // 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.
 
 #ifndef MEDIA_AUDIO_AUDIO_INPUT_CONTROLLER_H_
 #define MEDIA_AUDIO_AUDIO_INPUT_CONTROLLER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 360 matching lines @@
   // The silence report sent as UMA stat at the end of a session.
   SilenceState silence_state_ = SILENCE_STATE_NO_MEASUREMENT;
 #endif
 
   size_t prev_key_down_count_ = 0;
 
   // Time when the stream started recording.
   base::TimeTicks stream_create_time_;
 
   bool is_muted_ = false;
-  base::RepeatingTimer check_muted_state_timer_;
+
+  // Timer cannot be destroyed in destructor, due to threading, so keep it in an
+  // Optional.
+  base::Optional<base::RepeatingTimer> check_muted_state_timer_;
 
 #if BUILDFLAG(ENABLE_WEBRTC)
   // Used for audio debug recordings. Accessed on audio thread.
   AudioDebugRecordingHelper debug_recording_helper_;
 #endif
 
   class AudioCallback;
   // Holds a pointer to the callback object that receives audio data from
   // the lower audio layer. Valid only while 'recording' (between calls to
   // stream_->Start() and stream_->Stop()).
@@ skipping 15 matching lines @@
   // The weak_ptr_factory_ and all outstanding weak pointers, are invalidated
   // at the end of DoClose.
   base::WeakPtrFactory<AudioInputController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioInputController);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_INPUT_CONTROLLER_H_