Remove PermissionBackend#user(Provider<CurrentUser>)
Checking permissions of users that aren't the caller on the current request can have implications on the security of the system. The most prominent one is creating a group-oracle. To limit the cases where we could potentially expose Gerrit to these threats, PermissionBackend removes the method that was operating solely on the provider of the current user. Change-Id: I601ea1200a15a5f262ca0770b23cc1c7bee126b1
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