swap the renderer_ reference to local before calling Stop()

content/renderer/media/webrtc_audio_device_impl.cc

Index: content/renderer/media/webrtc_audio_device_impl.cc
diff --git a/content/renderer/media/webrtc_audio_device_impl.cc b/content/renderer/media/webrtc_audio_device_impl.cc
index e65ca33607c39abedb1e600fb9e10f2148df403b..cf4a6448350668ec20a8d35cae57dd9bc83e15bf 100644
--- a/content/renderer/media/webrtc_audio_device_impl.cc
+++ b/content/renderer/media/webrtc_audio_device_impl.cc
@@ -259,8 +259,11 @@ int32_t WebRtcAudioDeviceImpl::Terminate() {
 
   // It is necessary to stop the |renderer_| before going away.
   if (renderer_) {
-    renderer_->Stop();
-    renderer_ = NULL;
+    // Grab a local reference while we call Stop(), which will trigger a call to
+    // RemoveAudioRenderer that clears our reference to the audio renderer.
+    scoped_refptr<WebRtcAudioRenderer> local_renderer(renderer_);
+    local_renderer->Stop();
+    DCHECK(!renderer_);
   }
 
   if (capturer_) {