Delay unregistering handlers when a document is detached

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 996a28e911bf13003b2f50d01cf4cf77b99a505b..1de35c38a5b1870feb0483eaa733b1b4adc88c60 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -110,6 +110,7 @@
 #include "core/events/PageTransitionEvent.h"
 #include "core/events/ScopedEventQueue.h"
 #include "core/fetch/ResourceFetcher.h"
+#include "core/frame/EventHandlerRegistry.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/FrameConsole.h"
 #include "core/frame/FrameHost.h"
@@ -2204,6 +2205,7 @@ void Document::detach(const AttachContext& context)
 
     if (Document* parentDoc = parentDocument())
         parentDoc->didClearTouchEventHandlers(this);
+    frameHost()->eventHandlerRegistry().documentDetached(*this);
 
     // This is required, as our LocalFrame might delete itself as soon as it detaches
     // us. However, this violates Node::detach() semantics, as it's never