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This is a reland of 3014d931
with fix for a use after free of the NetworkMetadataStore held
by wifi sync classes.

Original change's description:
> Inject NetworkMetadataStore in wifi sync classes which depend on it.
>
> The instance of NetworkMetadataStore for a user profile is created
> after the sync service is already initialized.  This change does
> the necessary plumbing to get the metadata store instance to
> the wifi sync classes.
>
> Bug: 966270
> Change-Id: Icd235cd780df97a367f09f281f3e957893baa93b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2110079
> Commit-Queue: Jon Mann <jonmann@chromium.org>
> Reviewed-by: Marc Treib <treib@chromium.org>
> Reviewed-by: James Vecore <vecore@google.com>
> Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#752273}

TBR=stevenjb@chromium.org,treib@chromium.org

Bug: 966270
Change-Id: Ib4327a1a953ebee8d49775890eec2e6c353c4e5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2114586
Commit-Queue: Jon Mann <jonmann@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#753745}