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In this CL, we convert InProcessPrefServiceFactoryFactory from a
BrowserContextKeyedBaseFactory to a SimpleKeyedServiceFactory. This
allows the InProcessPrefServiceFactoryFactory be used before the
profile is created.

Bug: 937469
Change-Id: I2704875d84e553b3f3af40ec37109ac6e4786fbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1569347
Commit-Queue: Xi Han <hanxi@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652245}