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This CL moves the DomainDiversityReporter service from
//chrome/browser/history into //components/history/metrics and removes
the dependency on //content from this service. The factory for the
DomainDiversityReporter service is reimplemented for iOS.

Bug: 1132579
Change-Id: Ia4999a37a6028c48891d39c50188c3162ad4d3ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2558834Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Mingjing Zhang <mjzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837179}