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Add coverage for the "action" manifest key in ExtensionActionManager
unit tests.

Bug: 893373
Change-Id: Ifa2cabc26fc53088b45aca44133fceef2252e9ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1614438Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660240}