Stop using CheckedPtr with CSSStyleDeclaration. Use WeakPtr instead to generate more actionable crashes.
Pull request: https://github.com/WebKit/WebKit/pull/21812
Committed 272082@main (866fc9912f51): <https://commits.webkit.org/272082@main> Reviewed commits have been landed. Closing PR #21812 and removing active labels.
<rdar://problem/119693658>