Revert "Revert "migrate to sk_sp for SkFontMgr API""

This reverts commit f40ae1a4b5365620463bd63b5140bd3fc78894a1.

Bug: skia:
Change-Id: I752606de92ea405d6e50219c98030409b00a2841
Reviewed-on: https://skia-review.googlesource.com/51160
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
18 files changed