shorten the top-level var warning

When building caja, one of the warning messages starts 

  [transform] LINT : css-defs.js:46+1 - 777+7: Top level variable declarations incompatiable with Caja.  Please rewrite as window[ 'cssSchema' ] = (function () {

and continues for 730 lines.

There are several messages like this.  The one for Domado is 4328 lines.

This change omits the rhs of these warning messages.

[metaweta, 2012-05-25 05:05:40]

lgtm

[felix8a, 2012-05-25 05:58:41]

@r4890