[runtime] cleanup handling of private symbol + proxy

src/lookup.cc

Index: src/lookup.cc
diff --git a/src/lookup.cc b/src/lookup.cc
index 1265d9056ea74f046584ebb21248a882c77bf9f0..32c829b1b4a8cb5b57fcd47e4dd6e867a2577b32 100644
--- a/src/lookup.cc
+++ b/src/lookup.cc
@@ -596,7 +596,6 @@ LookupIterator::State LookupIterator::LookupInHolder(Map* const map,
   switch (state_) {
     case NOT_FOUND:
       if (map->IsJSProxyMap()) {
-        // Do not leak private property names.
         if (IsElement() || !name_->IsPrivate()) return JSPROXY;
       }
       if (map->is_access_check_needed()) {
@@ -606,9 +605,7 @@ LookupIterator::State LookupIterator::LookupInHolder(Map* const map,
     case ACCESS_CHECK:
       if (check_interceptor() && HasInterceptor(map) &&
           !SkipInterceptor(JSObject::cast(holder))) {
-        // Do not leak private property names.
-        if (!name_.is_null() && name_->IsPrivate()) return NOT_FOUND;
-        return INTERCEPTOR;
+        if (IsElement() || !name_->IsPrivate()) return INTERCEPTOR;
       }
     // Fall through.
     case INTERCEPTOR: