Remove usage of S.p.charCodeAt from uri.js

test/mjsunit/uri.js

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 70 matching lines @@
 assertEquals("", encodeURI(""));
 
 function test(string) {
   assertEquals(string, decodeURI(encodeURI(string)));
 }
 
 test("\u1234\u0123\uabcd");
 test("abcd");
 test("ab<\u1234\u0123");
 test("ab\u1234<\u0123");
+
+
+(function TestDeleteCharCodeAt() {
+  assertEquals('abc', encodeURI('abc'));
+  assertEquals('abc', decodeURI('abc'));
+  assertTrue(delete String.prototype.charCodeAt);
+  assertTrue(delete String.prototype.charAt);
+  assertEquals('abc', encodeURI('abc'));
+  assertEquals('abc', decodeURI('abc'));
+})();