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Offer data will be server-only data, so I figure we don't need two
clients integration tests.

Bug: 1093057
Change-Id: I8afb57ed49b7ab6d57071c331ea679fdf1928260
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453351
Commit-Queue: Siyu An <siyua@chromium.org>
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816337}