Copy of widevine change:
https://widevine-internal-review.googlesource.com/#/c/10911/
OEMCrypto_DeleteUsageTable used to return an error on every call
because UsageTable::Clear always returned false. Since there is no
error checking that Clear can do, its return type has been changed to
void, and DeleteUsageTable now returns OEMCrypto_SUCCESS for all
calls.
bug: 16799906
Change-Id: Iaa2f572e4b0feb554877579596a7f43a64d20954