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This CL is based on https://chromium-review.googlesource.com/c/chromium/src/+/1199944
When ServiceManager launches, ChromeFeatureListCreator will be created to
load the user pref store and a simple local state.
Later on the user pref store will be passed to BrowserProcessImpl to
create a new local state.
This CL simplifies the process by passing ChromeFeatureListCreator
to BrowserProcessImpl, so that the simple local state can be transformed
into g_browser_process->local_state.

BUG=866028

Change-Id: Ia2e6f67bc6dc54f31b6efc2cdabe6c7d4d6158ae
Reviewed-on: https://chromium-review.googlesource.com/1204926
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Xi Han <hanxi@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592179}