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 74e12311efe2152b6991c95eed9f73b2545f7ad6..16f0096ef32cd0e00a9faa13f5c3c7e8ede422fe 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"
@@ -205,6 +206,7 @@ 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
@@ -552,6 +554,7 @@ void Page::clearWeakMembers(Visitor* visitor)
     if (input)
         input->clearWeakMembers(visitor);
 #endif
+    EventHandlerRegistry::from(*this)->clearWeakMembers(visitor);
 }
 
 void Page::willBeDestroyed()