Bug 686545 - Fix build bustage with nsRefreshDriver/nsARefreshObserver not being defined. r=ehsan

The buld bustage only appears with some options being disabled in the
mozconfig. Likely, nsRefreshDriver.h is included by another hedear that isn't
included when an option is disabled.

accessible/src/base/NotificationController.h

@@ -41,6 +41,7 @@
 
 #include "AccEvent.h"
 #include "nsCycleCollectionParticipant.h"
+#include "nsRefreshDriver.h"
 
 class nsAccessible;
 class nsDocAccessible;

layout/base/nsPresShell.h

@@ -73,6 +73,7 @@
 #include "nsFrameSelection.h"
 #include "nsGUIEvent.h"
 #include "nsContentUtils.h"
+#include "nsRefreshDriver.h"
 
 class nsIRange;
 class nsIDragService;