SkString: simplify impl

Change-Id: Ie35a5c2b7dae0376eb1eb677648d80cf1688faf4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/126641
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Auto-Submit: Hal Canary <halcanary@google.com>
2 files changed