Switching AudioInputDeviceManager from using AudioManager interface to AudioSystem one.

media/audio/audio_system.cc

Index: media/audio/audio_system.cc
diff --git a/media/audio/audio_system.cc b/media/audio/audio_system.cc
index 953be40caa007d0ede558a8faef95d2e2babc6ab..1d082ae5686b99c677a5871845ab02ccc35f16a5 100644
--- a/media/audio/audio_system.cc
+++ b/media/audio/audio_system.cc
@@ -3,11 +3,26 @@
 // found in the LICENSE file.
 
 #include "media/audio/audio_system.h"
+#include "base/single_thread_task_runner.h"
 
 namespace media {
 
 static AudioSystem* g_last_created = nullptr;
 
+void AudioSystem::OnAudioThreadDeleter::operator()(
+    const AudioSystem* instance) const {
+  CHECK(instance);
+  AudioSystem::ClearInstance(instance);
+
+  if (instance->GetTaskRunner()->BelongsToCurrentThread()) {
+    delete instance;
+    return;
+  }
+  if (!instance->GetTaskRunner()->DeleteSoon(FROM_HERE, instance)) {
+    LOG(WARNING) << "Failed to delete AudioManager instance.";
+  }
+}
+
 AudioSystem::~AudioSystem() {}
 
 AudioSystem* AudioSystem::Get() {