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Blocklisted extensions may have additional disable reasons added such as
when they are added to an additional safe browsing blocklist. Allow
extensions that are already in the blocklisted set to have their disable
reasons updated.

This also allows us to remove a one-off condition in ExtensionPrefs that
side-stepped this condition.

Bug: 1073570
Change-Id: I300f6b3dde6617c56ee0dd8d92c6cdc0bebe58b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622452
Commit-Queue: Jeff Cyr <jeffcyr@google.com>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842728}