Remove explicit -Wextra-semi, -Winconsistent-missing-override flags. They're enabled via the chromium_code config already these days. No intended behavior change. Bug: chromium:926235,chromium:428099 Change-Id: I6927d6e3ec85f40454da61969d7a22dfabef1bde Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1564781 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Nico Weber <thakis@chromium.org>