make ctor and setter consistent -- just take the typeface param as is

Bug: skia: 8626
Change-Id: Ia730c5e28039760f4e194d97abe892052509e735
Reviewed-on: https://skia-review.googlesource.com/c/177345
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2 files changed