Rubber-stamped by Holger Freyther.

        There seems to be some rounding error in cairo (or in how we use
        cairo) with some fonts, like DejaVu Sans Mono, which makes cairo
        report a height smaller than ascent + descent, which is wrong and
        confuses WebCore's layout system. Workaround this while we figure
        out what's going on.

        * platform/graphics/gtk/SimpleFontDataGtk.cpp:
        (WebCore::SimpleFontData::platformInit):
        * platform/graphics/gtk/SimpleFontDataPango.cpp:
        (WebCore::SimpleFontData::platformInit):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@41856 268f45cc-cd09-0410-ab3c-d52691b4dbfc