This is to simplify implementation of new feature flags.
- Move helper functions to anonymous namespace.
- Add members to avoid passing everything by function paramaters.
Bug: webrtc:14508
Change-Id: I0a4958645a4eb76515f28d8ce868a66be6748919
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/277720
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38274}