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In certain specific and rare edge cases, we might end up setting ruleset
prefs for an uninstalled extension. This can happen in:
  - RulesMonitorService::OnRulesetLoaded: This is dispatched when the
    extension rulesets are loaded. We reset the ruleset checksums if the
    extension was re-indexed due to a schema change.
  - RulesMonitorService::OnDynamicRulesUpdated:
    This is dispatched when the dynamic rules for an extension are
    updated on disk.

Return early in both these cases to ensure we don't incorrectly modify
extension prefs for an uninstalled extension.

BUG=1067441

Change-Id: Ib2d1a94265ab73871b8ae791481fe0ec25234d60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2131222
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756410}