Improve quality of verified domain 3p checking

[bbondy]

Description

Associate some domains with others for our shields 3p checking.

Example:
ksandbox.org and www.khanacademy.org

https://twitter.com/pamelafox/status/1114210142893953024

Currently checks are done via SameDomainOrHost

Steps to Reproduce

1. Go to https://www.khanacademy.org/computer-programming/new/pjs
2. Type in some code
3. Hit save

Actual result:

Error happens because of device recognition blocking

Expected result:

Should work

Reproduces how often:

Always

Brave version (brave://version info)

All, tested on 0.64.36

Reproducible on current release:

• Does it reproduce on brave-browser dev/beta builds? Yes

Website problems only:

• Does the issue resolve itself when disabling Brave Shields? yes
• Is the issue reproducible on the latest version of Chrome? no

[fmarier]

That domain isn't in the Mozilla list I mentioned in #3194 so if we were to start with that list, we would likely need to fork it or supplement it with a Brave-specific list.