Bug 523651. Add a CallQueryInterface that works well with nsCOMPtr. r=bsmedberg

xpcom/glue/nsCOMPtr.h

@@ -1412,6 +1412,14 @@ getter_AddRefs( nsCOMPtr<T>& aSmartPtr )
     return nsGetterAddRefs<T>(aSmartPtr);
   }
 
+template <class T, class DestinationType>
+inline
+nsresult
+CallQueryInterface( T* aSource, nsGetterAddRefs<DestinationType> aDestination )
+{
+    return CallQueryInterface(aSource,
+                              static_cast<DestinationType**>(aDestination));
+}
 
 
   // Comparing two |nsCOMPtr|s