WebProcesses often crash if they access the network after a NetworkProcess crash. One easily reproducible example is to go to CNN.com, then `killall -9 NetworkProcess`, then refresh CNN.com. Under cookiesForDOM or setCookiesFromDOM, you'll see an ASSERT accessing the NetworkProcessConnection in a debug build or a crash using it in a release build. In radar as <rdar://problem/12865789>
Created attachment 180008 [details] Patch v1
http://trac.webkit.org/changeset/138060