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This class is currently unused. Also, the ability to switch out the
VoteReceipt in ChangeVote() will go away in a future CL, rendering this
class obsolete.

Bug: 971272
Change-Id: Ie5d59b3d6ebba10acbb312e63aaaa701b20690ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518207
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823864}