Add RegisterService, split out of Connect().

third_party/WebKit/Source/platform/ServiceConnector.h

Index: third_party/WebKit/Source/platform/ServiceConnector.h
diff --git a/third_party/WebKit/Source/platform/ServiceConnector.h b/third_party/WebKit/Source/platform/ServiceConnector.h
index 6d6b56b6fc915205253a55fb0128b819721bdaf1..250a40189b01f069dc98ea643a530ea0d5486a30 100644
--- a/third_party/WebKit/Source/platform/ServiceConnector.h
+++ b/third_party/WebKit/Source/platform/ServiceConnector.h
@@ -39,7 +39,7 @@ class ServiceConnector {
 
     service_manager::mojom::blink::InterfaceProviderPtr remoteInterfaces;
     m_connector->Connect(std::move(remoteIdentity),
-                         MakeRequest(&remoteInterfaces), nullptr,
+                         MakeRequest(&remoteInterfaces),
                          base::Bind(&ServiceConnector::onConnectionCompleted));
 
     remoteInterfaces->GetInterface(Interface::Name_, request.PassMessagePipe());