Signature.verify should not throw if called twice

Bug: http://code.google.com/p/android/issues/detail?id=34933
Bug: 6870225

(cherry-picked from 52ec5bcc7d5d042d7ba6d0244d98ee72007a95e4)

Change-Id: I29ee6feb4df9505b1691418a9213fe69f840e1ea
2 files changed