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This CL changes RulesRegistry::DeserializeAndAddRules() to bail out if
the extension has been unloaded. This may have been the cause of some
crashes where a ContentAction was being created for an unloaded
extension.

Bug: 1010336, 1115969
Change-Id: Ibbd01c1b5b0a8f4cc3c2668fbb4b804189ba0b20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2345939
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800433}