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Adding user event data type to sync on iOS. Available only if unified
consent is enabled.

Bug: 827072
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ib8c01a40dd10e2aa61df65cad9ddfa6bb8881774
Reviewed-on: https://chromium-review.googlesource.com/1150140
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578344}