DrawingArea should be using a smart pointer to point to WebPage instead of a raw reference.
Pull request: https://github.com/WebKit/WebKit/pull/16777
<rdar://problem/114365841>
Committed 267261@main (7d2d82a98ab4): <https://commits.webkit.org/267261@main> Reviewed commits have been landed. Closing PR #16777 and removing active labels.