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Adds several user actions for interacting with the site access settings
on an extension's settings page. The user actions are specific to the
interface for extensions with "all_url" like host permissions requested
and don't cover the interface for extensions with a specific list of
hosts requested in their permissions.

For descriptions of the new user actions, check the changes to
actions.xml

Bug: 1102658
Change-Id: Iaaa547f3eec40c7fa4db84ff0724076cc700f18e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298177
Commit-Queue: Tim Judkins <tjudkins@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791337}