remove Brave from autosuggest and history (again)

[diracdeltas]

fix #7655

Test Plan:

1. automated tests should pass
2. open clean instance of brave
3. type 'fa' into urlbar. you should not see brave's facebook page in the autosuggest.
4. go to about:history. there should be no brave sites.

• 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:

[bsclifton]

Changes look great! 😄 I ran the automated tests and then also ran some manual tests. Everything works as expected 👍 Let me confirm with @bradleyrichter and if he's good with it, let's merge 😄 Thanks!

[bradleyrichter]

Cool. this keeps pre-loading tiles flexibility? Thanks @diracdeltas !