cryptohome: remove constant for CheckKey/AsyncCheckKey

These methods are deprecated and no longer used, so remove the
method name constants to prevent new users from showing up. They
should be using CheckKeyEx instead.

BUG=chromium:809616
TEST=build_packages

Change-Id: I072c4f14178c9ba367592c6ea3b58a29bd8f8923
Reviewed-on: https://chromium-review.googlesource.com/926711
Commit-Ready: Eric Caruso <ejcaruso@chromium.org>
Tested-by: Eric Caruso <ejcaruso@chromium.org>
Reviewed-by: Andrey Pronin <apronin@chromium.org>
1 file changed