Revert 253415 "Reduce sandbox permissions granted to alternate d..."

This is being reverted due to ValidationSuite.TestAlternateDesktop failures
on the Vista and XP bots.

> Reduce sandbox permissions granted to alternate desktop
> 
> This pass adds the first round of deny ACEs for the Winstation and
> Desktop objects. Assuming these stick, I'll get more aggressive in
> a follow-up.
> 
> BUG=346586
> 
> Review URL: https://codereview.chromium.org/178423005

TBR=jschuh@chromium.org

Review URL: https://codereview.chromium.org/180243011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253438 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253438