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This CL adds SchemeType::SCHEME_DEVTOOLS to ContentSettingsPattern, so
it's easier to handle auto-granted permissions registered with
WebUIAllowlist in site settings.

This is a followup based on discussions in https://crrev.com/c/2262758.

Fixed: 1101889
Change-Id: I761a8df60f4fc05c1f92e0ca9761be749b29b88d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2279346Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Jiewei Qian  <qjw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790250}