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This helper method is needed to fully complete TestingPrefServiceSimple
initialization in unit tests.

Bug: 992889
Change-Id: I752b2a3333375177448cbe37e4945e08cfdbbdc8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810917
Commit-Queue: Nikita Podguzov <nikitapodguzov@google.com>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Dominic Battré <battre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697644}