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

test/mjsunit/string-oom-slow-escape.js

Index: test/mjsunit/string-oom-slow-escape.js
diff --git a/test/mjsunit/string-oom-slow-escape.js b/test/mjsunit/string-oom-slow-escape.js
deleted file mode 100644
index 34088c0efc63659aec6ee0f42ca946d58976eb4a..0000000000000000000000000000000000000000
--- a/test/mjsunit/string-oom-slow-escape.js
+++ /dev/null
@@ -1,14 +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 a = '<';
-for (var i = 0; i < 26; i++) a += a;
-a = a + a + a;
-
-function escape_a() {
-  escape(a);
-}
-
-assertThrows(escape_a, RangeError);