Remove NewJSObjectWithMemento

Seems unused.

Review-Url: https://codereview.chromium.org/2483103002
Cr-Commit-Position: refs/heads/master@{#40843}

src/factory.cc

@@ -1632,16 +1632,6 @@ Handle<JSObject> Factory::NewJSObject(Handle<JSFunction> constructor,
 }
 
 
-Handle<JSObject> Factory::NewJSObjectWithMemento(
-    Handle<JSFunction> constructor,
-    Handle<AllocationSite> site) {
-  JSFunction::EnsureHasInitialMap(constructor);
-  CALL_HEAP_FUNCTION(
-      isolate(),
-      isolate()->heap()->AllocateJSObject(*constructor, NOT_TENURED, *site),
-      JSObject);
-}
-
 Handle<JSObject> Factory::NewJSObjectWithNullProto() {
   Handle<JSObject> result = NewJSObject(isolate()->object_function());
   Handle<Map> new_map =

src/factory.h

@@ -438,9 +438,6 @@ class V8_EXPORT_PRIVATE Factory final {
   // runtime.
   Handle<JSObject> NewJSObject(Handle<JSFunction> constructor,
                                PretenureFlag pretenure = NOT_TENURED);
-  // JSObject that should have a memento pointing to the allocation site.
-  Handle<JSObject> NewJSObjectWithMemento(Handle<JSFunction> constructor,
-                                          Handle<AllocationSite> site);
   // JSObject without a prototype.
   Handle<JSObject> NewJSObjectWithNullProto();