Delete mjsunit/string-oom-slow-* tests.

test/mjsunit/string-oom-slow-to-uppercase.js

Index: test/mjsunit/string-oom-slow-to-uppercase.js
diff --git a/test/mjsunit/string-oom-slow-to-uppercase.js b/test/mjsunit/string-oom-slow-to-uppercase.js
deleted file mode 100644
index 79f975bd0d400f979fc9d0722c2255bc814654b0..0000000000000000000000000000000000000000
--- a/test/mjsunit/string-oom-slow-to-uppercase.js
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright 2014 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-var s = "\u00df";  // ß
-for (var i = 0; i < 27; i++) s += s;
-
-function upper() {
-  s.toUpperCase();
-}
-
-assertThrows(upper, RangeError);