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Currently, user_prefs::UserPrefs::Get() is only needed within the
context of WebLayer's safe browsing implementation on Android. However,
it will shortly also be needed by WebLayer's SSL implementation (when we
change that implementation to be based on the shared
//components-level one rather than being a fork). SSL interstitials
run on all platforms (concretely, Linux as well as Android). In
preparation for that change, this CL moves the creation and ownership of
WebLayer's user prefs service into BrowserContextImpl. This change both
ensures that the PrefService is created and registered on all platforms
rather than only Android and also aligns WebLayer with how user pref
service creation and ownership is structured in other embedders in
which user_prefs::UserPrefs::Get() is broadly used (e.g.,
Android WebView and Chrome).

Bug: 1026591
Change-Id: Ibab57af127aca76f3944389896f538b1f2571e9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1930658Reviewed-by: Tim Volodine <timvolodine@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719073}