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While working on removing field_trial_default and metrics_default
(in order to avoid link time replacement and use better defaults), we
discovered that runtime_enabled_features (which also has a _default
implementation) is not used (more info on this here:
https://bugs.chromium.org/p/webrtc/issues/detail?id=9631#c21).

Usage of this code has been removed in WebRTC with this CL:
https://webrtc-review.googlesource.com/c/src/+/102361.

Bug: webrtc:9631
Change-Id: Ief33059cd329f429b9bbdd7520808e62e3f6f62b
Reviewed-on: https://chromium-review.googlesource.com/1249029Reviewed-by: Henrik Grunell <grunell@chromium.org>
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595040}