SkTypeface: remove old virtual onGetAdvancedMetrics, since https://crrev.com/2860293003

Change-Id: Iad30b03fc8b34bdea2fe902f83a0dd979c16f1a7
Reviewed-on: https://skia-review.googlesource.com/15633
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
2 files changed