Revert of 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 80f8a213093a81881a19c1b50e4bddf4114f6783..5ddc425d503edce9ceb0efa51ba468647c15f275 100644
--- a/media/audio/alsa/audio_manager_alsa.cc
+++ b/media/audio/alsa/audio_manager_alsa.cc
@@ -86,13 +86,8 @@
   return HasAnyAlsaAudioDevice(kStreamCapture);
 }
 
-AudioManagerAlsa::AudioManagerAlsa(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-    scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
-    AudioLogFactory* audio_log_factory)
-    : AudioManagerBase(std::move(task_runner),
-                       std::move(worker_task_runner),
-                       audio_log_factory),
+AudioManagerAlsa::AudioManagerAlsa(AudioLogFactory* audio_log_factory)
+    : AudioManagerBase(audio_log_factory),
       wrapper_(new AlsaWrapper()) {
   SetMaxOutputStreamsAllowed(kMaxOutputStreams);
 }