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For browser actions, certain properties are persisted, while others are
not. (By contrast, page actions do not persist any properties).

Since we're introducing the generic "action" key, we need to provide
defined behavior for persistence. In this case, we default to *not*
persisting values. This is consistent across properties (unlike
browser action), and it is easier to add in support later if we
evaluate that it would be worthwhile.

Add a browsertest that covers both browser action values and the
new "action" values.

Bug: 1110156, 893373
Change-Id: Icc4472599e52e0309cab0b3704ea9394865787de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439975Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815847}