The new tests I added in Bug 156057 (r198955) cause a crash in the Networking process on OS X when built with the NETWORK_SESSION flag turned on. This is because the new NETWORK_SESSION code does not handle Blob URLs properly.
This patch corrects the specific cause of the crash in our testing infrastructure. The actual fixes for BLOB URLs will be done under Bug 156099.
Specific failing test cases:
Created attachment 275566 [details]
Committed r199021: <http://trac.webkit.org/changeset/199021>