Remove SkExclusiveStrikePtr. Replace it with sk_sp<SkStrike>

* Rename all the Exclusive things.

Change-Id: If6b5fec5130bf58c396e0a472730efd2ae38c0d2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/273057
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Herb Derby <herb@google.com>
10 files changed