[gtk+] Drop the css parser enum test

[Matthias Clasen <matthiasc src gnome org>]

commit 1f298c385fc198dc9c5a84c103116d8c76a25ef3
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Dec 21 14:25:46 2015 -0500

    Drop the css parser enum test
    
    We are no longer using and non-css properties, and css enums
    are all parsed with custom code.

 testsuite/css/parser/enum.css     |   32 --------------------------------
 testsuite/css/parser/enum.errors  |    6 ------
 testsuite/css/parser/enum.ref.css |    7 -------
 3 files changed, 0 insertions(+), 45 deletions(-)