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In preparation of adding support for session scoped rules (which are not
file backed), split the class FileBackedRulesetSource into two classes:
a RulesetSource base class and a FileBackedRulesetSource derived class.
Since the session scoped ruleset will not be file backed, it will use
the RulesetSource class.

BUG=1043200

Change-Id: Ia06d4b2ca956de516a542aa3dc69bc70cbe1829d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495787
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Kelvin Jiang <kelvinjiang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827760}