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This CL brings up RulesetService in WebLayer as a first step to enabling
the subresource filter component. To facilitate this bringup, this CL
refactors much of the //chrome-level creation of RulesetService into a
static RulesetService::Create() method that is shared between //weblayer
and //chrome.

Bug: 1116095
Change-Id: I285bc68fd59164826696cc700a3fbe7b934e582a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434342
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811825}