Added check for trailing whitespaces and corrected existing violations.

test/mjsunit/string-slices.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 39 matching lines @@
 assertEquals(s.substring(s.length - 1), s.substr(-1));
 assertEquals(s.substring(s.length - 1), s.substr(-1.2));
 assertEquals(s.substring(s.length - 1), s.substr(-1.7));
 assertEquals(s.substring(s.length - 2), s.substr(-2));
 assertEquals(s.substring(s.length - 2), s.substr(-2.3));
 assertEquals(s.substring(s.length - 2, s.length - 1), s.substr(-2, 1));
 assertEquals(s, s.substr(-100));
 assertEquals('abc', s.substr(-100, 3));
 assertEquals(s1, s.substr(-s.length + 1));
 
-// assertEquals('', s.substr(0, void 0)); // smjs and rhino 
+// assertEquals('', s.substr(0, void 0)); // smjs and rhino
 assertEquals('abcdefghijklmn', s.substr(0, void 0));  // kjs and v8
 assertEquals('', s.substr(0, null));
 assertEquals(s, s.substr(0, String(s.length)));
 assertEquals('a', s.substr(0, true));
 
 
 // Test substrings of different lengths and alignments.
 // First ASCII.
 var x = "ASCII";
 for (var i = 0; i < 25; i++) {
@@ skipping 118 matching lines @@
 assertEquals("\u03B2\u03B3\u03B4\u03B5\u03B4\u03B5\u03B6\u03B7",
     utf.substring(5,1) + utf.substring(3,7));
 
 /*
 // Externalizing strings.
 var a = "123456789qwertyuiopasdfghjklzxcvbnm";
 var b = a.slice(1,-1);
 assertEquals(a.slice(1,-1), b);
 externalizeString(a);
 assertEquals(a.slice(1,-1), b);
-*/
+*/