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We remove the parameter of PrefService* from ProfileKey's constructor. This is
because some KeyedService are created using ProfileKey* before the PrefService
is created in the Profile. For example, SuperviseUserSettingService and
InProcessPrefServiceFactoryFactory.

Bug: 937469
Change-Id: I45c4b849e229a34ec6f465e428a7a514e9f77118
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1568793Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Commit-Queue: Xi Han <hanxi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652220}