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Removing suggestions will remove the underlying autofill data from which
it originated. It is possible to remove both autocomplete suggestions
as well as profile data for addresses and credit cards.

This method will be covered with integration tests in follow up CLs.

Bug: 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I53a273eed33024e42c89b85cd10dd718cea00884
Reviewed-on: https://chromium-review.googlesource.com/792256Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: John Wu <jzw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520168}