Making AudioManagerBase::ShutdownOnAudioThread() platform-agnostic

media/audio/mac/audio_manager_mac.cc

Index: media/audio/mac/audio_manager_mac.cc
diff --git a/media/audio/mac/audio_manager_mac.cc b/media/audio/mac/audio_manager_mac.cc
index 09b6433e631d819fc6bc87ab72f4c55b5cc672d1..f8c94ab2ef57f8310cb9ceb4c48199bb9646887f 100644
--- a/media/audio/mac/audio_manager_mac.cc
+++ b/media/audio/mac/audio_manager_mac.cc
@@ -527,12 +527,12 @@ AudioManagerMac::AudioManagerMac(std::unique_ptr<AudioThread> audio_thread,
 
 AudioManagerMac::~AudioManagerMac() = default;
 
-void AudioManagerMac::ShutdownOnAudioThread() {
+void AudioManagerMac::ShutdownOnAudioThread(bool immediately) {
   // We are now in shutdown mode. This flag disables MaybeChangeBufferSize()
   // and IncreaseIOBufferSizeIfPossible() which both touches native Core Audio
   // APIs and they can fail and disrupt tests during shutdown.
   in_shutdown_ = true;
-  AudioManagerBase::ShutdownOnAudioThread();
+  AudioManagerBase::ShutdownOnAudioThread(immediately);
 }
 
 bool AudioManagerMac::HasAudioOutputDevices() {