[keys] support shadowing keys in the KeyAccumulator

src/messages.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/messages.h"
 
 #include "src/api.h"
 #include "src/execution.h"
 #include "src/isolate-inl.h"
 #include "src/keys.h"
@@ skipping 268 matching lines @@
 
   HandleScope outer_scope(isolate_);
   Handle<Object> result;
   for (PrototypeIterator iter(isolate_, obj, kStartAtReceiver); !iter.IsAtEnd();
        iter.Advance()) {
     Handle<Object> current = PrototypeIterator::GetCurrent(iter);
     if (!current->IsJSObject()) break;
     Handle<JSObject> current_obj = Handle<JSObject>::cast(current);
     if (current_obj->IsAccessCheckNeeded()) break;
     Handle<FixedArray> keys =
-        KeyAccumulator::GetEnumPropertyKeys(isolate_, current_obj);
+        KeyAccumulator::GetOwnEnumPropertyKeys(isolate_, current_obj);
     for (int i = 0; i < keys->length(); i++) {
       HandleScope inner_scope(isolate_);
       if (!keys->get(i)->IsName()) continue;
       Handle<Name> name_key(Name::cast(keys->get(i)), isolate_);
       if (!CheckMethodName(isolate_, current_obj, name_key, fun_,
                            LookupIterator::OWN_SKIP_INTERCEPTOR))
         continue;
       // Return null in case of duplicates to avoid confusion.
       if (!result.is_null()) return isolate_->factory()->null_value();
       result = inner_scope.CloseAndEscape(name_key);
@@ skipping 139 matching lines @@
       builder.AppendCharacter(*c);
     }
   }
 
   return builder.Finish();
 }
 
 
 }  // namespace internal
 }  // namespace v8