Stopping cached AudioOutputDevices on AudioRendererSinkCache destruction.

content/renderer/media/audio_renderer_sink_cache_impl.cc

Index: content/renderer/media/audio_renderer_sink_cache_impl.cc
diff --git a/content/renderer/media/audio_renderer_sink_cache_impl.cc b/content/renderer/media/audio_renderer_sink_cache_impl.cc
index 7c495eeec54028eaa55e49adddf7fb15ffd96a8b..26b2ba5a31b4e53a3a78ef4858910b12d2623398 100644
--- a/content/renderer/media/audio_renderer_sink_cache_impl.cc
+++ b/content/renderer/media/audio_renderer_sink_cache_impl.cc
@@ -68,7 +68,12 @@ AudioRendererSinkCacheImpl::AudioRendererSinkCacheImpl(
 }
 
 AudioRendererSinkCacheImpl::~AudioRendererSinkCacheImpl() {
-  // We just release all the cached sinks here.
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  // We just release all the cached sinks here. Stop them first.
+  // We can stop all the sinks, no matter they are used or not, since everything
+  // is being destroyed anyways.
+  for (auto& entry : cache_)
+    entry.sink->Stop();
 }
 
 media::OutputDeviceInfo AudioRendererSinkCacheImpl::GetSinkInfo(