In Python 3, we can invoke super() without specifying the class. Convert all super() calls in ews-build.webkit.org.
<rdar://problem/104571002>
Pull request: https://github.com/WebKit/WebKit/pull/8989
Committed 259240@main (04a6432da4ec): <https://commits.webkit.org/259240@main> Reviewed commits have been landed. Closing PR #8989 and removing active labels.