Rewrite GetPropertyAttribute to use the LookupIterator

src/contexts.cc

Index: src/contexts.cc
diff --git a/src/contexts.cc b/src/contexts.cc
index fbd99b19ce227e2195f80b198138a97cbbd5b202..cb5e852d7d669c07c8d8b950016defff1572f49c 100644
--- a/src/contexts.cc
+++ b/src/contexts.cc
@@ -108,9 +108,9 @@ Handle<Object> Context::Lookup(Handle<String> name,
       // to only do a local lookup for context extension objects.
       if ((flags & FOLLOW_PROTOTYPE_CHAIN) == 0 ||
           object->IsJSContextExtensionObject()) {
-        *attributes = JSReceiver::GetOwnPropertyAttribute(object, name);
+        *attributes = JSReceiver::GetOwnPropertyAttributes(object, name);
       } else {
-        *attributes = JSReceiver::GetPropertyAttribute(object, name);
+        *attributes = JSReceiver::GetPropertyAttributes(object, name);
       }
       if (isolate->has_pending_exception()) return Handle<Object>();