Since the flag is now on by default, we can remove it (after all callers stop passing it). We can also remove all Chart JSON code from WebRTC since it is no longer used. Requires one recipe CL and one downstream CL to land first. Bug: chromium:1029452 Change-Id: Ic1d62e8ab9dfcd255cd2bf51d153db80d59c564b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/171878 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Patrik Höglund <phoglund@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30927}