[proxies] Use JSReceiver::GetKeys() for more purposes

src/js/symbol.js

Index: src/js/symbol.js
diff --git a/src/js/symbol.js b/src/js/symbol.js
index 62ef0dd2167bfc6185bde0adf0d92775a7b16464..5be6e0168d7a2d2629340264fdfcf09b3db0de3b 100644
--- a/src/js/symbol.js
+++ b/src/js/symbol.js
@@ -18,14 +18,12 @@ var isConcatSpreadableSymbol =
     utils.ImportNow("is_concat_spreadable_symbol");
 var iteratorSymbol = utils.ImportNow("iterator_symbol");
 var MakeTypeError;
-var ObjectGetOwnPropertyKeys;
 var toPrimitiveSymbol = utils.ImportNow("to_primitive_symbol");
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 var unscopablesSymbol = utils.ImportNow("unscopables_symbol");
 
 utils.Import(function(from) {
   MakeTypeError = from.MakeTypeError;
-  ObjectGetOwnPropertyKeys = from.ObjectGetOwnPropertyKeys;
 });
 
 // -------------------------------------------------------------------
@@ -80,9 +78,7 @@ function SymbolKeyFor(symbol) {
 function ObjectGetOwnPropertySymbols(obj) {
   obj = TO_OBJECT(obj);
 
-  // TODO(arv): Proxies use a shared trap for String and Symbol keys.
-
-  return ObjectGetOwnPropertyKeys(obj, PROPERTY_ATTRIBUTES_STRING);
+  return %GetOwnPropertyKeys(obj, PROPERTY_FILTER_SKIP_STRINGS);
 }
 
 // -------------------------------------------------------------------