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The related spec change:
  https://github.com/w3c/payment-handler/pull/276

Payment Handler feature is behind a flag:
  chrome://flags/#service-worker-payment-apps

FYI, the original field type was `repeated string`, and the changed
field type is `optional string`. So, if `enabledMethods` data is
stored in a previous version, when reading the `method` field in a new
version, the protobuf will read the first element of `enabledMethods`.
Therefore, DB migration is not required.

Bug: 828894
Change-Id: Ic5775768eaff9584517956f2984473e8b6a0a411
Reviewed-on: https://chromium-review.googlesource.com/986121Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Jinho Bang <jinho.bang@samsung.com>
Cr-Commit-Position: refs/heads/master@{#548750}