Track scroll event handlers in nested documents

Source/core/page/Page.cpp

Index: Source/core/page/Page.cpp
diff --git a/Source/core/page/Page.cpp b/Source/core/page/Page.cpp
index 800c4df63e33508f716888d8774f8044b80fbf67..f569d0a4189fcf64f2d456e1b7b15478f8ea0233 100644
--- a/Source/core/page/Page.cpp
+++ b/Source/core/page/Page.cpp
@@ -43,6 +43,7 @@
 #include "core/page/ChromeClient.h"
 #include "core/page/ContextMenuController.h"
 #include "core/page/DragController.h"
+#include "core/page/EventHandlerRegistry.h"
 #include "core/page/FocusController.h"
 #include "core/page/FrameTree.h"
 #include "core/page/PageLifecycleNotifier.h"
@@ -204,6 +205,7 @@ void Page::documentDetached(Document* document)
     m_contextMenuController->documentDetached(document);
     if (m_validationMessageClient)
         m_validationMessageClient->documentDetached(*document);
+    EventHandlerRegistry::from(*this)->documentDetached(*document);
 }
 
 bool Page::openedByDOM() const