Make more JS files beter match the coding standard.

test/mjsunit/object-prevent-extensions.js

 // Copyright 2010 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 40 matching lines @@
 assertTrue(Object.isExtensible(obj2));
 
 Object.preventExtensions(obj2);
 assertEquals(42, obj2.x);
 
 obj2.y = 42;
 // obj2.y should still be undefined.
 assertEquals(undefined, obj2.y);
 // Make sure we can still write values to obj.x.
 obj2.x = 43;
-assertEquals(43, obj2.x)
+assertEquals(43, obj2.x);
 
 obj2.y = new function() { return 42; };
 // obj2.y should still be undefined.
 assertEquals(undefined, obj2.y);
-assertEquals(43, obj2.x)
+assertEquals(43, obj2.x);
 
 try {
   Object.defineProperty(obj2, "y", {value: 42});
 } catch (e) {
   assertTrue(/object is not extensible/.test(e));
 }
 
 // obj2.y should still be undefined.
 assertEquals(undefined, obj2.y);
 assertEquals(43, obj2.x);
@@ skipping 30 matching lines @@
 
 // Test that attributes on functions are also handled correctly.
 function foo() {
   return 42;
 }
 
 Object.preventExtensions(foo);
 
 foo.x = 29;
 assertEquals(undefined, foo.x);