Motown: Don't build out pipelines for streams that don't get rendered.

services/media/factory_service/media_sink_impl.h

Index: services/media/factory_service/media_sink_impl.h
diff --git a/services/media/factory_service/media_sink_impl.h b/services/media/factory_service/media_sink_impl.h
index 8b842f10caba06676577c43b9f9f96751cb6ea9a..8e29f28b0cea129e53ca2709748c358afb053845 100644
--- a/services/media/factory_service/media_sink_impl.h
+++ b/services/media/factory_service/media_sink_impl.h
@@ -40,36 +40,6 @@ class MediaSinkImpl : public MediaFactoryService::Product<MediaSink>,
       InterfaceRequest<MediaTimelineControlSite> req) override;
 
  private:
-  class NullTimelineControlSite : public MediaTimelineControlSite,
-                                  public TimelineConsumer {
-   public:
-    NullTimelineControlSite(
-        InterfaceRequest<MediaTimelineControlSite> control_site_request);
-
-    ~NullTimelineControlSite() override;
-
-    // MediaTimelineControlSite implementation.
-    void GetStatus(uint64_t version_last_seen,
-                   const GetStatusCallback& callback) override;
-
-    void GetTimelineConsumer(
-        InterfaceRequest<TimelineConsumer> timeline_consumer) override;
-
-    // TimelineConsumer implementation.
-    void SetTimelineTransform(
-        int64_t subject_time,
-        uint32_t reference_delta,
-        uint32_t subject_delta,
-        int64_t effective_reference_time,
-        int64_t effective_subject_time,
-        const SetTimelineTransformCallback& callback) override;
-
-   private:
-    Binding<MediaTimelineControlSite> control_site_binding_;
-    Binding<TimelineConsumer> consumer_binding_;
-    GetStatusCallback get_status_callback_;
-  };
-
   MediaSinkImpl(InterfaceHandle<MediaRenderer> renderer,
                 MediaTypePtr media_type,
                 InterfaceRequest<MediaSink> request,