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This CL adds a RegisterAutoGrantedPermissions method WebUIAllowlist.
This method allows registering a list of permissions, instead of doing
a for-loop.

Also adds a comment about permissions (and content settings) commonly
wanted by WebUIs.

Bug: 1109773
Change-Id: I50c05d3b2b7672978dbf53c267ddcaa0352c0545
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2336425Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: Jiewei Qian  <qjw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796297}