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The Site Details page currently only shows two options in the drop-down menu
for each permission, 'Allow' and 'Block'. This change adds a third option to the
list, which shows the default option, similar to the Page Info bubble.

The "Site Details" page that opens should show matching permissions to those
seen in the Page Info bubble, including the defaults - e.g. Javascript should be
"Allow (default)", Popups should be "Block (default)", and Camera should be
"Ask (default)". Navigating to chrome:settings/content/camera and toggling the
"Ask before accessing (recommended)" option should then make the Site Details
page for for https://permission.site show "Block (default)" next to the Camera
permission.

Bug: 656758
Change-Id: I74cd332c44d8fcb1ab5c700e4fa394ce74fe973b
Test: With the #enable-site-details flag turned on, navigate to
https: //permission.site, open the Page Info bubble, and click "Site settings".
Reviewed-on: https://chromium-review.googlesource.com/558541
Commit-Queue: Patti <patricialor@chromium.org>
Reviewed-by: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488086}