Pass task runners to AudioManager constructor.

media/audio/alsa/audio_manager_alsa.cc

Index: media/audio/alsa/audio_manager_alsa.cc
diff --git a/media/audio/alsa/audio_manager_alsa.cc b/media/audio/alsa/audio_manager_alsa.cc
index b32b4d7d419a293a4385977a0875936583e61bce..52974fcae928cfb1fe5f627720f2f4666da7ccdb 100644
--- a/media/audio/alsa/audio_manager_alsa.cc
+++ b/media/audio/alsa/audio_manager_alsa.cc
@@ -85,8 +85,11 @@ bool AudioManagerAlsa::HasAudioInputDevices() {
   return HasAnyAlsaAudioDevice(kStreamCapture);
 }
 
-AudioManagerAlsa::AudioManagerAlsa(AudioLogFactory* audio_log_factory)
-    : AudioManagerBase(audio_log_factory),
+AudioManagerAlsa::AudioManagerAlsa(
+    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
+    const scoped_refptr<base::SingleThreadTaskRunner>& worker_task_runner,
+    AudioLogFactory* audio_log_factory)
+    : AudioManagerBase(task_runner, worker_task_runner, audio_log_factory),
       wrapper_(new AlsaWrapper()) {
   SetMaxOutputStreamsAllowed(kMaxOutputStreams);
 }