Make sure IPC queue from NetworkProcess to WebProcess doesn't grow too large because the remote WebProcess is suspended.
<rdar://108762771>
Pull request: https://github.com/WebKit/WebKit/pull/13366
Committed 263600@main (712e63a8c545): <https://commits.webkit.org/263600@main> Reviewed commits have been landed. Closing PR #13366 and removing active labels.