Remove the now unused _ANGLE targets. BUG=522967 Change-Id: I9a5c1793b089920273c74ab43fd5464d0aea7adb Reviewed-on: https://chromium-review.googlesource.com/324022 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Corentin Wallez <cwallez@chromium.org> Tested-by: Corentin Wallez <cwallez@chromium.org>