Stop AudioOutputDevice in destructor

It is possible an AudioOutputDevice is created
and waiting for authorization when destruction
happens. Add a stop call to ensure it gets
cleaned up.

Bug: b/141012708
Test: Local build, before/after manual testing.
Change-Id: If454095f2d3d44d20b84a9135151248372b0a574
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832727Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Brett Kilty <brettk@google.com>
Cr-Commit-Position: refs/heads/master@{#702041}

chromecast/media/audio/cast_audio_device_factory.cc

@@ -65,7 +65,7 @@ class NonSwitchableAudioRendererSink
   void Flush() override { output_device_->Flush(); }
 
  protected:
-  ~NonSwitchableAudioRendererSink() override = default;
+  ~NonSwitchableAudioRendererSink() override { output_device_->Stop(); }
 
  private:
   scoped_refptr<::media::AudioOutputDevice> output_device_;