Disable FLoC in Brave

[pes10k]

Currently Brave disables the FLoC component. However there is other FLoC functionality shipped in Chromium (behind origin trials). We should disable FLoC completely in Brave, including:

1. FLoC client-side determinations of cohorts
2. Any reporting of FLoC cohort determinations to Google (or otherwise) servers (i.e., the reporting used for k-anonymity cohort protections)
3. FLoC JS methods (i.e. document.interestCohort)
4. Any UI related to the FloC permission (i.e., interest-cohort)

[iefremov]

@pes10k
can you please provide more details on "Any UI related to the FloC permission (i.e., interest-cohort)" - I haven't spotted any related UIs

[pes10k]

Sounds good, if there is no UI, then happy for that part to be a NOOP.

The explainer doc just says there is there will be a new permission, and so the request was to disable any UI (for example, any content setting control) related to that permission. But if that doesn't exist, then, even easier!

[kjozwiak]

Adding this into the 1.25.x as it landed via brave/brave-core#8468.