Remove whitespace from features json files Bug: angleproject:6435 Change-Id: I7f653a9836180d0f2e0198302e11ae2b0ca49d3b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3621315 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>