<rdar://problem/4564955> WebKit doesn't trigger Auto Font Activation

        If we don't find the font in the available fonts list, call [NSFont fontWithName:size:]
        to trigger a search that will include auto activation. No PLT or iBench perf impact.
        No layout tests affected. Not testable in an automated way that will work on all systems.

        * platform/mac/WebFontCache.mm:
        (+[WebFontCache fontWithFamily:traits:size:]):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@16252 268f45cc-cd09-0410-ab3c-d52691b4dbfc