ui: Cleanup class/struct forward declarations

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 3b78eaab106f873c9dbed5539abebcb92ed18cb8..7a39a7e504f190ec8fb10b9422d17236df08e729 100644
--- a/media/mojo/services/media_service.h
+++ b/media/mojo/services/media_service.h
@@ -18,6 +18,7 @@
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/service_manager/public/cpp/interface_factory.h"
 #include "services/service_manager/public/cpp/service.h"
+#include "services/service_manager/public/cpp/service_context.h"
 #include "services/service_manager/public/cpp/service_context_ref.h"
 #include "url/gurl.h"
 
@@ -32,8 +33,7 @@ class MEDIA_MOJO_EXPORT MediaService
           service_manager::InterfaceFactory<mojom::MediaService>),
       public NON_EXPORTED_BASE(mojom::MediaService) {
  public:
-  MediaService(std::unique_ptr<MojoMediaClient> mojo_media_client,
-               const base::Closure& quit_closure);
+  explicit MediaService(std::unique_ptr<MojoMediaClient> mojo_media_client);
   ~MediaService() final;
 
  private:
@@ -58,7 +58,7 @@ class MEDIA_MOJO_EXPORT MediaService
   std::unique_ptr<MojoMediaClient> mojo_media_client_;
 
   scoped_refptr<MediaLog> media_log_;
-  service_manager::ServiceContextRefFactory ref_factory_;
+  std::unique_ptr<service_manager::ServiceContextRefFactory> ref_factory_;
 
   mojo::BindingSet<mojom::MediaService> bindings_;
 };