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Make the Site Details web UI update permission values when they change without
needing to reload the Site Details page.

Manual test - With #enable-site-details on, open https://permission.site. Open
the Page Info bubble, click "Site settings", and drag the Site Details tab out
into a new window so that the https://permission.site and the Site Details
windows are viewable at the same time. On https://permission.site, open the Page
Info bubble and change a permission there. It should automatically update to
show the same permission in the Site Details page.

Bug: 656758
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: If1b28afbed3317a7ac43ada1d8ca02424137b50d
Reviewed-on: https://chromium-review.googlesource.com/595299
Commit-Queue: Patti <patricialor@chromium.org>
Reviewed-by: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491653}