[proxies] allow duplicate keys for [[OwnPropertyKeys]] trap.

src/runtime/runtime-forin.cc

Index: src/runtime/runtime-forin.cc
diff --git a/src/runtime/runtime-forin.cc b/src/runtime/runtime-forin.cc
index 57a05f6f3b6a84d48bf0c9cd38d470c54ede9e57..2fa6cbee19fffb875ee48d873342b038c10bab9a 100644
--- a/src/runtime/runtime-forin.cc
+++ b/src/runtime/runtime-forin.cc
@@ -24,8 +24,9 @@ MaybeHandle<HeapObject> Enumerate(Handle<JSReceiver> receiver) {
   if (!receiver->IsSimpleEnum()) {
     Handle<FixedArray> keys;
     ASSIGN_RETURN_ON_EXCEPTION(
-        isolate, keys, JSReceiver::GetKeys(receiver, JSReceiver::INCLUDE_PROTOS,
-                                           ENUMERABLE_STRINGS),
+        isolate, keys,
+        JSReceiver::GetKeys(receiver, KeyCollectionType::INCLUDE_PROTOS,
+                            ENUMERABLE_STRINGS),
         HeapObject);
     // Test again, since cache may have been built by GetKeys() calls above.
     if (!receiver->IsSimpleEnum()) return keys;