Prepare removal of ObjectTemplate::New without Isolate parameter.

test/cctest/test-object-observe.cc

Index: test/cctest/test-object-observe.cc
diff --git a/test/cctest/test-object-observe.cc b/test/cctest/test-object-observe.cc
index 8e927b0b4f1d8ad06776af4cf5b8b60156f148e5..0a30d4e275b8e96864076234e5c0890c954b25db 100644
--- a/test/cctest/test-object-observe.cc
+++ b/test/cctest/test-object-observe.cc
@@ -517,7 +517,7 @@ static Handle<Object> CreateAccessCheckedObject(
     NamedSecurityCallback namedCallback,
     IndexedSecurityCallback indexedCallback,
     Handle<Value> data = Handle<Value>()) {
-  Handle<ObjectTemplate> tmpl = ObjectTemplate::New();
+  Handle<ObjectTemplate> tmpl = ObjectTemplate::New(isolate);
   tmpl->SetAccessCheckCallbacks(namedCallback, indexedCallback, data);
   Handle<Object> instance = tmpl->NewInstance();
   Handle<Object> global = instance->CreationContext()->Global();