Bug 1318803: provide reason for IPC_FAIL in case of STUN filtering. r=jdm

MozReview-Commit-ID: JTClCwfLB0f

--HG--
extra : rebase_source : b5c3e2e812595b7d8887780ae64e72a029b81ec8

dom/network/UDPSocketParent.cpp

@@ -352,7 +352,7 @@ UDPSocketParent::RecvOutgoingData(const UDPData& aData,
 
     // Sending unallowed data, kill content.
     if (NS_WARN_IF(NS_FAILED(rv)) || !allowed) {
-      return IPC_FAIL_NO_REASON(this);
+      return IPC_FAIL(this, "Content tried to send non STUN packet");
     }
   }