Fixes bug 66837. Query interface needed. r=dougt, sr=mscott.

netwerk/base/src/nsStreamListenerProxy.cpp

@@ -356,7 +356,8 @@ nsStreamListenerProxy::Init(nsIStreamListener *aListener,
                              PR_TRUE, PR_TRUE);
     if (NS_FAILED(rv)) return rv;
 
-    SetReceiver(aListener);
+    nsCOMPtr<nsIStreamObserver> observer = do_QueryInterface(aListener);
+    SetReceiver(observer);
     return SetEventQueue(aEventQ);
 }
 

netwerk/base/src/nsStreamProviderProxy.cpp

@@ -280,6 +280,7 @@ nsStreamProviderProxy::Init(nsIStreamProvider *aProvider,
                              PR_TRUE, PR_TRUE);
     if (NS_FAILED(rv)) return rv;
 
-    SetReceiver(aProvider);
+    nsCOMPtr<nsIStreamObserver> observer = do_QueryInterface(aProvider);
+    SetReceiver(observer);
     return SetEventQueue(aEventQ);
 }