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Adds new, almost empty, WebUI page at chrome://settings/privacySandbox,
which is built to enable access to existing chrome://settings resources.

This is a standalone HTML page separate from the main chrome://settings
SPA, but served from the same WebUI controller. This allows it to access
resources directly via chrome://settings/[settings.js,lazy_load.js]

Skipping string check as adding screenshots without context is of low
value.

Skip-Translation-Screenshots-Check: True
Bug: 1152336
Change-Id: I084b57ea51ab750604cd14563b4e688e7c35133e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2557502
Commit-Queue: Theodore Olsauskas-Warren <sauski@google.com>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832411}