Add Facebook CDN to the referrer exceptions list

[Slava]

Fixes #14358

Had to tweak the logic to accept regexs to catch all FBCDN subdomains

Auditors:

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed. (Ask a Brave employee to help if you cannot access this document.)

Test Plan:

Go to any facebook video page and make sure the video plays at various points
You can use this page as an example: https://www.facebook.com/peopleareawesome/videos/1393626100686564/

Reviewer Checklist:

• Request a security/privacy review as needed if one was not already requested.

Tests

• Adequate test coverage exists to prevent regressions
• Tests should be independent and work correctly when run individually or as a suite ref
• New files have MPL2 license header

[Slava]

@diracdeltas

[diracdeltas]

lgtm

[bsclifton]

master 8fd8073
0.24.x 1b3fa64

[bsclifton]

Uplifted to 0.23.x with a13dd4a