Enable printer_description_unittest.cc.

NOTRY=true
R=joi@chromium.org

Review URL: https://codereview.chromium.org/135163005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248817 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248817