Remove left-over generated runtime test from mjsunit.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/734633002

Cr-Commit-Position: refs/heads/master@{#25372}

test/mjsunit/runtime-gen/loadfromsuper.js

-// Copyright 2014 the V8 project authors. All rights reserved.
-// AUTO-GENERATED BY tools/generate-runtime-tests.py, DO NOT MODIFY
-// Flags: --allow-natives-syntax --harmony --harmony-proxies
-var _home_object = new Object();
-var _receiver = new Object();
-var _name = "name";
-%LoadFromSuper(_home_object, _receiver, _name);