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This CL completes the implementation of the updateEnabledRulesets
extension function by persisting the set of enabled static rulesets to
prefs. This ensures that the setting is persisted across extension
loads and sessions. Note that this setting is cleared on extension
update.

BUG=754526

Change-Id: I2e87d658f97abb33fb69355c16c6c7587f37a5db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2191731
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768563}