GitLab

This CL checks if the |history_service| is valid before it is used to
build a DomainDiversityReporter. This is a guard against unexpected
crashes in DomainDiversityReporter which always requires a valid
history service.

Bug: 1161727
Change-Id: Ie946abe755f7a32bf7b7173e3b146326459edcf5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611668Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Mingjing Zhang <mjzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841700}