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More specifically, the `prompt` field of the `CollectDataSpecification` message was previously unused, but is now passed along to AutofillAssistantPaymentRequest, which will show the prompt in the title of the UI. If not set, the UI defaults to the title of the web-contents (as before).

Bug: 806868
Change-Id: I37b8d9570b5833095eca6070871c211a7a775c24
Reviewed-on: https://chromium-review.googlesource.com/c/1301441
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603465}