Bug 1931739. Switch RAII classes in layout code from MOZ_STACK_CLASS to MOZ_RAII. r=longsonr

Differential Revision: https://phabricator.services.mozilla.com/D229258

layout/base/PresShell.cpp

@@ -554,7 +554,7 @@ class nsBeforeFirstPaintDispatcher : public Runnable {
 // This is a helper class to track whether the targeted frame is destroyed after
 // dispatching pointer events. In that case, we need the original targeted
 // content so that we can dispatch the mouse events to it.
-class MOZ_STACK_CLASS AutoPointerEventTargetUpdater final {
+class MOZ_RAII AutoPointerEventTargetUpdater final {
  public:
   AutoPointerEventTargetUpdater(PresShell* aShell, WidgetEvent* aEvent,
                                 nsIFrame* aFrame, nsIContent* aTargetContent,