UploadStash::removeFileNoAuth shouldn't need auth

UploadStash::getFile has a "noAuth" parameter, which should be set true
when this is called from UploadStash::removeFileNoAuth.

Callers should already be doing their own auth checking, or calling
UploadStash::removeFile.

Bug: 56298
Change-Id: Ic70c4e2bc6df5cb9b139a3631766f8ff0ec4ef02