Don't throw when there is an "onError" for int.parse.

runtime/lib/integers.cc

Index: runtime/lib/integers.cc
diff --git a/runtime/lib/integers.cc b/runtime/lib/integers.cc
index 4962ac9e134106b99722d29be89685735c660e9b..5be23af2fea9dbcd0f8a48ea9d524ea1cfc778ac 100644
--- a/runtime/lib/integers.cc
+++ b/runtime/lib/integers.cc
@@ -216,9 +216,6 @@ DEFINE_NATIVE_ENTRY(Integer_parse, 1) {
     return Integer::New(temp);
   }
 
-  const Array& args = Array::Handle(Array::New(1));
-  args.SetAt(0, value);
-  Exceptions::ThrowByType(Exceptions::kFormat, args);
   return Object::null();
 }