Fixed AudioInputController muted state related tsan bug.

media/audio/audio_input_controller.cc

Index: media/audio/audio_input_controller.cc
diff --git a/media/audio/audio_input_controller.cc b/media/audio/audio_input_controller.cc
index c048bf3b44abc72816e99aab51817f5824a2e79d..b860937d1f470418cfe2adc5d98731f9859db9a1 100644
--- a/media/audio/audio_input_controller.cc
+++ b/media/audio/audio_input_controller.cc
@@ -200,7 +200,7 @@ AudioInputController::AudioInputController(
 AudioInputController::~AudioInputController() {
   DCHECK(!audio_callback_);
   DCHECK(!stream_);
-  DCHECK(!check_muted_state_timer_.IsRunning());
+  DCHECK(!check_muted_state_timer_);
 }
 
 // static
@@ -364,10 +364,12 @@ void AudioInputController::DoCreateForStream(
   is_muted_ = stream_->IsMuted();
   handler_->OnCreated(this, is_muted_);
 
-  check_muted_state_timer_.Start(
+  // Start a new repeating timer to keep the muted state updated.
+  check_muted_state_timer_.emplace();
+  check_muted_state_timer_->Start(
       FROM_HERE, base::TimeDelta::FromSeconds(kCheckMutedStateIntervalSeconds),
       this, &AudioInputController::CheckMutedState);
-  DCHECK(check_muted_state_timer_.IsRunning());
+  DCHECK(check_muted_state_timer_->IsRunning());
 }
 
 void AudioInputController::DoRecord() {
@@ -397,7 +399,8 @@ void AudioInputController::DoClose() {
   if (!stream_)
     return;
 
-  check_muted_state_timer_.Stop();
+  // Stop and destroy the mute check timer.
+  check_muted_state_timer_.reset();
 
   std::string log_string;
   static const char kLogStringPrefix[] = "AIC::DoClose:";