Bug 545591: Temporary workaround.

ipc/ipdl/test/cxx/PTestArraysSub.ipdl

@@ -3,11 +3,11 @@ include protocol "PTestArrays.ipdl";
 namespace mozilla {
 namespace _ipdltest {
 
-protocol PTestArraysSub {
+sync protocol PTestArraysSub {
     manager PTestArrays;
 
 parent:
-    __delete__();
+    sync __delete__();
 };
 
 } // namespace _ipdltest