Stop using CheckedPtr with MessagePortChannel. Use WeakPtr instead to generate more actionable crashes.
Pull request: https://github.com/WebKit/WebKit/pull/21841
Committed 272094@main (1251f3ceb887): <https://commits.webkit.org/272094@main> Reviewed commits have been landed. Closing PR #21841 and removing active labels.
<rdar://problem/119705357>