Revert of media: Use StrongBindingSet for InterfaceFactoryImpl in MediaService

media/mojo/services/media_service.h

Index: media/mojo/services/media_service.h
diff --git a/media/mojo/services/media_service.h b/media/mojo/services/media_service.h
index a2d4704dd9e517186e43ab679444c2d6bdf12ff2..2efd74a25de9949b56d99766952e1ce23dd3200f 100644
--- a/media/mojo/services/media_service.h
+++ b/media/mojo/services/media_service.h
@@ -17,7 +17,6 @@
 #include "media/mojo/interfaces/media_service.mojom.h"
 #include "media/mojo/services/media_mojo_export.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
-#include "mojo/public/cpp/bindings/strong_binding_set.h"
 #include "services/service_manager/public/cpp/binder_registry.h"
 #include "services/service_manager/public/cpp/service.h"
 #include "services/service_manager/public/cpp/service_context.h"
@@ -56,8 +55,6 @@
   // a unique_ptr here.
   std::unique_ptr<MojoMediaClient> mojo_media_client_;
 
-  mojo::StrongBindingSet<mojom::InterfaceFactory> interface_factory_bindings_;
-
   MediaLog media_log_;
   std::unique_ptr<service_manager::ServiceContextRefFactory> ref_factory_;