Moving SwitchOutputDevice out of OutputDevice interface, eliminating OutputDevice

media/audio/null_audio_sink.cc

Index: media/audio/null_audio_sink.cc
diff --git a/media/audio/null_audio_sink.cc b/media/audio/null_audio_sink.cc
index e9f65fd49c41900da649807553de09abe09be6b7..080056f2c3672d54899e534385804b1e0202ead8 100644
--- a/media/audio/null_audio_sink.cc
+++ b/media/audio/null_audio_sink.cc
@@ -79,6 +79,12 @@ OutputDevice* NullAudioSink::GetOutputDevice() {
   return nullptr;
 }
 
+void NullAudioSink::SwitchOutputDevice(const std::string& device_id,
+                                       const url::Origin& security_origin,
+                                       const SwitchOutputDeviceCB& callback) {
+  callback.Run(OUTPUT_DEVICE_STATUS_ERROR_INTERNAL);
+}
+
 void NullAudioSink::CallRender() {
   DCHECK(task_runner_->BelongsToCurrentThread());