Bug 829410 - Use threadsafe isupports in nsVolumeService. r=mikeh a=omg-everything-is-busted

dom/system/gonk/nsVolumeService.cpp

@@ -39,7 +39,9 @@ using namespace mozilla::services;
 namespace mozilla {
 namespace system {
 
-NS_IMPL_ISUPPORTS2(nsVolumeService, nsIVolumeService, nsIDOMMozWakeLockListener)
+NS_IMPL_THREADSAFE_ISUPPORTS2(nsVolumeService,
+                              nsIVolumeService,
+                              nsIDOMMozWakeLockListener)
 
 StaticRefPtr<nsVolumeService> nsVolumeService::sSingleton;