Make more JS files beter match the coding standard.

test/mjsunit/d8-os.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 26 matching lines @@
   try {
     eval(str);
   } catch (e) {
     assertTrue(/rgument/.test(e), str);
   }
 }
 
 
 function str_error(str) {
   var e = new Object();
-  e.toString = function() { throw new Error("foo bar"); }
+  e.toString = function() { throw new Error("foo bar"); };
   try {
     eval(str);
   } catch (exception) {
     assertTrue(/tring conversion/.test(exception), str);
   }
 }
 
 
 if (this.os && os.system) {
   try {
@@ skipping 117 matching lines @@
   str_error("os.system(e);");
   str_error("os.system('ls', [e]);");
   str_error("os.system('ls', ['.', e]);");
   str_error("os.system('ls', [e, '.']);");
   str_error("os.mkdirp(e);");
   str_error("os.setenv(e, 'goo');");
   str_error("os.setenv('goo', e);");
   str_error("os.chdir(e);");
   str_error("os.rmdir(e);");
 }