Make more JS files beter match the coding standard.

test/mjsunit/object-prevent-extensions.js

Index: test/mjsunit/object-prevent-extensions.js
diff --git a/test/mjsunit/object-prevent-extensions.js b/test/mjsunit/object-prevent-extensions.js
index 322a2cb5431655943a0c5a8878a8b293fc4cf4bd..4613144fea1b424ff96653499818022584ca0179 100644
--- a/test/mjsunit/object-prevent-extensions.js
+++ b/test/mjsunit/object-prevent-extensions.js
@@ -58,12 +58,12 @@ obj2.y = 42;
 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});