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1. Add API to enable explicit updates of expiration dates. This is
   needed to handle cases where user was issued a new card where
   only the expiration date and CVCs changed.

2. Remove CWVCreditCardVerifierErrorMessageKey and use
   NSLocalizedDescriptionKey instead.

Change-Id: Iff1dbed037d991be8d582c5e734d49e33916de99
Reviewed-on: https://chromium-review.googlesource.com/c/1325282
Commit-Queue: John Wu <jzw@chromium.org>
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606383}