Added automatic mode to FakeInputAudioStream to generate automatic beeps

media/audio/mock_audio_manager.cc

Index: media/audio/mock_audio_manager.cc
diff --git a/media/audio/mock_audio_manager.cc b/media/audio/mock_audio_manager.cc
index e774b8cf2ff2bea32ebf3252b67a8416a9c70f2e..7183405a19063f1e44800336e1867ba7d4a9c733 100644
--- a/media/audio/mock_audio_manager.cc
+++ b/media/audio/mock_audio_manager.cc
@@ -34,11 +34,8 @@ void MockAudioManager::ShowAudioInputSettings() {
 
 void MockAudioManager::GetAudioInputDeviceNames(
     AudioDeviceNames* device_names) {
-  DCHECK(device_names->empty());
-  device_names->push_back(media::AudioDeviceName("fake_device_name_1",
-                                                 "fake_device_id_1"));
-  device_names->push_back(media::AudioDeviceName("fake_device_name_2",
-                                                 "fake_device_id_2"));
+  // Do not inject fake devices here, use
+  // AudioInputDeviceManager::GetFakeDeviceNames() instead.
 }
 
 void MockAudioManager::GetAudioOutputDeviceNames(