Reviewed by Darin Adler.

    Reviewed by Darin Adler.

        - fix http://bugs.webkit.org/show_bug.cgi?id=16548
          <rdar://problem/5659452> REGRESSION(r28810): Font style and sizes are weird for Japanese text

        * platform/graphics/win/FontCacheWin.cpp:
        (WebCore::linkedFontEnumProc): Added. This callback is used to fetch
        a valid LOGFONT for a given family.
        (WebCore::getLinkedFonts): Added. Returns a vector of font families
        linked to the given font family by the Windows registry key
        HKLM\Software\...\FontLink\SystemLink. The registry values typically
        differ based on the installed language version of Windows.
        (WebCore::FontCache::getFontDataForCharacters): Changed to not use MLang
        font mapping, which is Windows code page based, except for characters in
        the range U+2000..U+200F. Instead, this function gets the font Uniscribe
        would use for the character. However, that font might not actually
        contain the character, in which case GDI font linking would substitute a
        different font. Therefore, this function walks the linked font list
        until it finds a font that actually contains the character.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@29140 268f45cc-cd09-0410-ab3c-d52691b4dbfc