Eliminate some overrides of `clippedOverflowRect()`
<rdar://problem/118946413>
Pull request: https://github.com/WebKit/WebKit/pull/21066
Committed 271323@main (c4e7c9cb3176): <https://commits.webkit.org/271323@main> Reviewed commits have been landed. Closing PR #21066 and removing active labels.