simplify SkTHash* move support

Don't know why I thought this had to be so complicated before.

BUG=skia:6053

Change-Id: Ie714fed1cb47e9add166d4227d3d31f95eba2411
Reviewed-on: https://skia-review.googlesource.com/6121
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed