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Update the Site Access section to meet the new mocks. Instead of a drop
down, include a radio button group to support selection of site access
options. Incorporate the list of allowed sites, if the "specific sites"
option is selected, into the radio group item.

This is a purely aesthetic change and has no functional difference. Test
changes are only to update identifiers.

Screenshots: https://imgur.com/a/SgAhyJu

Bug: 914523

Change-Id: Ib9521f1a4196c8030babb9041560c573e146b39b
Reviewed-on: https://chromium-review.googlesource.com/c/1385483
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618678}