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This is a reland of e2cac39f

Original change's description:
> Settings: Content settings can now be reset for a group of origins in All Sites.
> 
> Add a three-dot / overflow menu to groups of origins in All Sites. This overflow
> menu allows the entire list of origins to have all their content settings reset
> in one go. This will be preceded with a confirmation dialog.
> 
> Manual test - With #enable-site-settings turned on, change a content setting via
> Page Info > Site settings on both https://permission.site and
> http://permission.site. Navigate to chrome://settings/content/all and see that
> both sites are listed under 'permission.site'. Verify there is an overflow menu
> on this entry and that inside the overflow menu, there is a 'Reset permissions'
> option. Clicking this should bring up a reset permission dialog and confirming
> the dialog should remove this entry from All Sites.
> 
> Bug: 835712, 717468
> Cq-Include-Trybots: luci.chromium.try:closure_compilation
> Change-Id: I777f759c26bf0fe7f8da086fa887969897cf9833
> Reviewed-on: https://chromium-review.googlesource.com/1098577
> Commit-Queue: Patti <patricialor@chromium.org>
> Reviewed-by: Dave Schuyler <dschuyler@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#568742}

Bug: 835712, 717468
Change-Id: I6560d10b31602038daa03f57fc67b6a878794d5a
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Reviewed-on: https://chromium-review.googlesource.com/1109537
Commit-Queue: Patti <patricialor@chromium.org>
Reviewed-by: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569507}