Update SkFontMgr_fuchsia.cpp for new FIDL API

There's an incoming change to use std:: types for non-nullable strings
and vectors.

See: https://fuchsia-review.googlesource.com/c/garnet/+/236996
Change-Id: I4dcc1b7c132769f4409ee649f65baaf6d6958d8b
Reviewed-on: https://skia-review.googlesource.com/c/179994
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed