Handlify PropertyAttribute lookups.

src/contexts.cc

Index: src/contexts.cc
diff --git a/src/contexts.cc b/src/contexts.cc
index 964347f7e4be5fb758595ec58b90ce3b798c1fc4..ada6e049a67727baa66362f198497cbaa7ed1f03 100644
--- a/src/contexts.cc
+++ b/src/contexts.cc
@@ -131,9 +131,9 @@ 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 = object->GetLocalPropertyAttribute(*name);
+        *attributes = JSReceiver::GetLocalPropertyAttribute(object, name);
       } else {
-        *attributes = object->GetPropertyAttribute(*name);
+        *attributes = JSReceiver::GetPropertyAttribute(object, name);
       }
       if (isolate->has_pending_exception()) return Handle<Object>();