remove (unused and weird) zoom parameter on getFontMetrics

Bug: skia:
Change-Id: I17d1d79da7518aaa37daf22768f1b2624bd59bcf
Reviewed-on: https://skia-review.googlesource.com/c/167540
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2 files changed