don't use nested form of FontMetrics

Bug: skia:
Change-Id: I80294c33671552ff0b484acd8d7e144d2f13eb51
Reviewed-on: https://skia-review.googlesource.com/c/171082
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed