Pass task runners to AudioManager constructor.

media/audio/fake_audio_manager.cc

Index: media/audio/fake_audio_manager.cc
diff --git a/media/audio/fake_audio_manager.cc b/media/audio/fake_audio_manager.cc
index 3d7640144a96cf393d03c4c62fee6d7f16220b4c..fc1513a553a3d0e11ff8813c289abb0b7240969a 100644
--- a/media/audio/fake_audio_manager.cc
+++ b/media/audio/fake_audio_manager.cc
@@ -13,12 +13,15 @@ const int kDefaultSampleRate = 48000;
 
 }  // namespace
 
-FakeAudioManager::FakeAudioManager(AudioLogFactory* audio_log_factory)
-    : AudioManagerBase(audio_log_factory) {}
-
-FakeAudioManager::~FakeAudioManager() {
-  Shutdown();
-}
+FakeAudioManager::FakeAudioManager(
+    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) {}
+
+FakeAudioManager::~FakeAudioManager() {}
 
 // Implementation of AudioManager.
 bool FakeAudioManager::HasAudioOutputDevices() { return false; }