Remove mutablePaint from glyphRuns

This call confuses future paint changes.

Change-Id: Ie4c37f4c74d999c212992252bb65d06cd259c647
Reviewed-on: https://skia-review.googlesource.com/c/167687
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Herb Derby <herb@google.com>
5 files changed