| Index: src/runtime/runtime-strings.cc | 
| diff --git a/src/runtime/runtime-strings.cc b/src/runtime/runtime-strings.cc | 
| index 761176d54a3ae8f83ca58b7f7301d07327fc9db2..517513ed4e42230ecdc92c2e1afc7da34d9a5a67 100644 | 
| --- a/src/runtime/runtime-strings.cc | 
| +++ b/src/runtime/runtime-strings.cc | 
| @@ -399,7 +399,7 @@ RUNTIME_FUNCTION(Runtime_StringBuilderConcat) { | 
| CONVERT_ARG_HANDLE_CHECKED(String, special, 2); | 
|  | 
| size_t actual_array_length = 0; | 
| -  CHECK(TryNumberToSize(isolate, array->length(), &actual_array_length)); | 
| +  CHECK(TryNumberToSize(array->length(), &actual_array_length)); | 
| CHECK(array_length >= 0); | 
| CHECK(static_cast<size_t>(array_length) <= actual_array_length); | 
|  | 
|  |