Fix MediaRemoting MediaObserver

content/renderer/media/media_factory.cc

Index: content/renderer/media/media_factory.cc
diff --git a/content/renderer/media/media_factory.cc b/content/renderer/media/media_factory.cc
index efeba89bc79c54e629737d969dab9764b1e6a27b..c6839cefa16abf2b14c7d463fa7280f6c49d0694 100644
--- a/content/renderer/media/media_factory.cc
+++ b/content/renderer/media/media_factory.cc
@@ -216,6 +216,10 @@ blink::WebMediaPlayer* MediaFactory::CreateMediaPlayer(
       CreateRendererFactorySelector(media_log.get(), use_media_player_renderer,
                                     GetDecoderFactory(), &media_observer);
 
+#if BUILDFLAG(ENABLE_MEDIA_REMOTING)
+  DCHECK(media_observer);
+#endif
+
   if (!url_index_.get() || url_index_->frame() != web_frame)
     url_index_.reset(new media::UrlIndex(web_frame));
 
@@ -349,8 +353,7 @@ MediaFactory::CreateRendererFactorySelector(
   std::unique_ptr<RemotingController> remoting_controller(
       new RemotingController(new media::remoting::SharedSession(
           std::move(remoting_source_request), std::move(remoter))));
-  base::WeakPtr<media::MediaObserver> media_observer =
-      remoting_controller->GetWeakPtr();
+  *out_media_observer = remoting_controller->GetWeakPtr();
 
   auto courier_factory =
       base::MakeUnique<media::remoting::CourierRendererFactory>(