undef fontmetrics flag -- rely on clients to opt in

Bug: skia:
Change-Id: Icc43da90659c47e3499a67babc5696651dcf004d
Reviewed-on: https://skia-review.googlesource.com/c/177346
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed