Remove unused SkPath::unique()

It was only supported for ANDROID_FRAMEWORK, which no longer uses it.
(It looks like the last use was removed with
ag/I18bfe51896672272ce7d471eaead69b651399368.)

Change-Id: Ia0811a8625d6a20ae7411a7578a5358ff1cc1a37
Reviewed-on: https://skia-review.googlesource.com/c/170480
Auto-Submit: Leon Scroggins <scroggo@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>
2 files changed