Turn on SK_DISABLE_LEGACY_FONTMGR_FACTORY

I modified Skottie to use the same SkFontMgr as the default was,
so as not change the historical codesize part too much (effectively
undoing part of http://review.skia.org/773576)

Change-Id: I9c3e8eca455cdae49a9716f1bea0429933867afa
Bug: b/305780908
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/778318
Owners-Override: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
10 files changed