Fix problems with file:/// URLs

[diracdeltas]

fix #8967, fix #8947

test plan:

1. automated unittest and noscript test should pass
2. disable scripts globally. open test/fixtures/noscript2.html as a file:// URL in brave
3. open a new tab and type 'fi'. there should be no console errors.
4. in the file:// tab, click the noscript icon and 'allow until restart'
5. in a new tab, go to nytimes.com. you should see that scripts are blocked.

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).

Test Plan:

Reviewer Checklist:

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

[bbondy]

wow both problems with file:///
Thanks for the fixes. 💯