Remove SkTSwap.

No longer used. Use swappable instead.

Change-Id: I76935f33ac084dbe067c34de7fb332e51a063cb6
Reviewed-on: https://skia-review.googlesource.com/136221
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed