Typed and reviewed by Alexey Proskuryakov.

        https://bugs.webkit.org/show_bug.cgi?id=39682
        <rdar://problem/8026774> REGRESSION: WebKit nightly adding insane height to div at random

        Test: fast/css/custom-font-xheight.html

        * platform/graphics/mac/SimpleFontDataMac.mm: (WebCore::SimpleFontData::platformInit):
        Calling an Objective C method that returns a structure with a null object can leave garbage in
        returned value. Custom fonts don't have an NSFont, they only have a CGFont. Call
        platformBoundsForGlyph() function instead, which works with CGFont.
        (WebCore::SimpleFontData::platformBoundsForGlyph): Fixed to work on Tiger (for fonts that
        have an NSFont), since this is now used in more cases.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@60247 268f45cc-cd09-0410-ab3c-d52691b4dbfc