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This change further implements the functionality of AutofillOfferManager. AutofillManager now accesses a singleton AutofillOfferManager via the AutofillOfferManagerFactory. AutofillOfferManager then prepares a request which is sent to the PaymentsClient to retrieve offer data. In further CLs, the data retrieved during these calls will stored and used.

Change-Id: I384c95f26b9b3094d9b3387d467134ef5998396e
Bug: 1093057
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2258154
Commit-Queue: Ben Blake <fiorito@google.com>
Reviewed-by: Anne Lim <annelim@google.com>
Reviewed-by: Dominic Battré <battre@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Jared Saul <jsaul@google.com>
Reviewed-by: Siyu An <siyua@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798344}