Upstream has changed their recommended best practices, so we shouldn't be introducing any new TabHelpers. This will make doing things the new way much simpler in Brave.

https://chromium.googlesource.com/chromium/src/+/refs/tags/128.0.6613.5/docs/chrome_browser_design_principles.md

At its most simple level:

• New code should not introduce new TabHelpers
• New code should (ideally) not depend on Browser
• The new way of doing things is to add a unique_ptr<YourClass> to the TabFeatures