Disable geolocation in Tor profiles

[yrliou]

Fix brave/brave-browser#1353

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).
• Verified that these changes build without errors on
  • Windows
  • macOS
  • Linux
• Verified that these changes pass automated tests (npm test brave_unit_tests && npm test brave_browser_tests) on
  • Windows
  • macOS
  • Linux
• Ran git rebase master (if needed).
• 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.
• Add appropriate QA labels (QA/Yes or QA/No) to include the closed issue in milestone

Test Plan:

Manual test:

1. Visit https://browserleaks.com/geo in a normal window, will get a geolocation permission prompt.
2. Visit https://browserleaks.com/geo in a Tor window, result should be as below without any prompt:

Unit test:
npm test brave_unit_tests -- --filter=BraveHostContentSettingsMapTest.*

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions
• Verify test plan is specified in PR before merging to source

[yrliou]

Got some existing errors / time out when running unit tests and browser tests, but is unrelated to this change.

[yrliou]

master: 058d51a
0.56.x: 061c72e
0.55.x: 5d22b1f