[gin] Introduce Wrappable::GetObjectTemplate

mojo/apps/js/bindings/support.cc

Index: mojo/apps/js/bindings/support.cc
diff --git a/mojo/apps/js/bindings/support.cc b/mojo/apps/js/bindings/support.cc
index 2e627bdeed1b80f572f9fc7e6244bb6b80d8d4ae..99076807aa541f75dcee51a1c23b7065fc873c53 100644
--- a/mojo/apps/js/bindings/support.cc
+++ b/mojo/apps/js/bindings/support.cc
@@ -54,12 +54,10 @@ v8::Local<v8::ObjectTemplate> Support::GetTemplate(v8::Isolate* isolate) {
       &g_wrapper_info);
 
   if (templ.IsEmpty()) {
-    WaitingCallback::EnsureRegistered(isolate);
-
-     templ = gin::ObjectTemplateBuilder(isolate)
-        .SetMethod("asyncWait", AsyncWait)
-        .SetMethod("cancelWait", CancelWait)
-        .Build();
+    templ = gin::ObjectTemplateBuilder(isolate)
+                .SetMethod("asyncWait", AsyncWait)
+                .SetMethod("cancelWait", CancelWait)
+                .Build();
 
     data->SetObjectTemplate(&g_wrapper_info, templ);
   }