Reviewed by Dimitri Glazkov.

        Fix failing tests on chromium.
        https://bugs.webkit.org/show_bug.cgi?id=48160

        * fast/backgrounds/repeat/background-repeat-shorthand-expected.txt:
        * fast/backgrounds/repeat/margin-shorthand-expected.txt:
        * fast/backgrounds/repeat/resources/background-repeat-shorthand.js:
        (getShorthand):
        * fast/backgrounds/repeat/resources/margin-shorthand.js:
        (iconMarginValue):
        * fast/css/modify-ua-rules-from-javascript.html:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@70363 268f45cc-cd09-0410-ab3c-d52691b4dbfc