[es6] Implement parts of the Reflect object.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 66d80149fbaeb88ad687d2949ab02cabf2a4c501..bb10a35898d0576b4e9405e3e5d9ab76eaa3c415 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -5858,7 +5858,7 @@ MaybeHandle<Object> JSReceiver::DeleteProperty(Handle<JSReceiver> object,
                                                Handle<Name> name,
                                                LanguageMode language_mode) {
   LookupIterator it(object, name, LookupIterator::HIDDEN);
-  return JSObject::DeleteProperty(&it, language_mode);
+  return DeleteProperty(&it, language_mode);
 }
 
 
@@ -5866,7 +5866,7 @@ MaybeHandle<Object> JSReceiver::DeletePropertyOrElement(
     Handle<JSReceiver> object, Handle<Name> name, LanguageMode language_mode) {
   LookupIterator it = LookupIterator::PropertyOrElement(
       name->GetIsolate(), object, name, LookupIterator::HIDDEN);
-  return JSObject::DeleteProperty(&it, language_mode);
+  return DeleteProperty(&it, language_mode);
 }