Pass task runners to AudioManager constructor.

components/audio_modem/audio_recorder_impl.cc

Index: components/audio_modem/audio_recorder_impl.cc
diff --git a/components/audio_modem/audio_recorder_impl.cc b/components/audio_modem/audio_recorder_impl.cc
index 8d1b2c5913f34f9e975e74ba5a144134bb8b97cd..06bc72827fda4426d789da30b71e0745659b5c14 100644
--- a/components/audio_modem/audio_recorder_impl.cc
+++ b/components/audio_modem/audio_recorder_impl.cc
@@ -198,20 +198,4 @@ void AudioRecorderImpl::OnError(media::AudioInputStream* /* stream */) {
                  base::Unretained(this)));
 }
 
-void AudioRecorderImpl::FlushAudioLoopForTesting() {
-  if (media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread())
-    return;
-
-  // Queue task on the audio thread, when it is executed, that means we've
-  // successfully executed all the tasks before us.
-  base::RunLoop rl;
-  media::AudioManager::Get()->GetTaskRunner()->PostTaskAndReply(
-      FROM_HERE,
-      base::Bind(
-          base::IgnoreResult(&AudioRecorderImpl::FlushAudioLoopForTesting),
-          base::Unretained(this)),
-      rl.QuitClosure());
-  rl.Run();
-}
-
 }  // namespace audio_modem