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This is a reland of 3b42f46a

The original patch has been reverted with crrev.com/c/1162402.
The issue has been fixed with crrev.com/c/1163714. This patch
can be relanded.
The patch is to start the UnifiedConsentService at startup.

Original change's description:
> [iOS] Start unified consent service at startup
>
> Bug: 827072
> Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
> Change-Id: I2f2e14ceba73ebecbc9c0222ae87ea86e4f91a49
> Reviewed-on: https://chromium-review.googlesource.com/1159062
> Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
> Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
> Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#580485}

TBR: sdefresne
Bug: 827072
Change-Id: I3332f38fb24d4ba77e75a70d0201bae71b56cc67
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Reviewed-on: https://chromium-review.googlesource.com/1165062Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581220}