Make more JS files beter match the coding standard.

test/mjsunit/regress/regress-515.js

 // Copyright 2009 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 19 matching lines @@
 // The test passes if it does not crash.
 
 var length = 2048;
 var s = "";
 for (var i = 0; i < 2048; i++) {
   s += '.';
 }
 
 var string = s + 'x' + s + 'x' + s;
 
-string.replace(/x/g, "")
+string.replace(/x/g, "");