remove SkFontHost::GetFileName

All remaining impls were either empty, or always return 0 for ttcIndex (its only value).
This functionality is now totally subsumed by SkTypeface::openStream()



git-svn-id: http://skia.googlecode.com/svn/trunk@8321 2bbb7eff-a529-9590-31e7-b0007b416f81
11 files changed