Remove all event listeners during window's frame destruction step.

Source/core/frame/LocalDOMWindow.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 45 matching lines @@
 
 enum PageshowEventPersistence {
     PageshowEventNotPersisted = 0,
     PageshowEventPersisted = 1
 };
 
 // Note: if you're thinking of returning something DOM-related by reference,
 // please ping dcheng@chromium.org first. You probably don't want to do that.
 class LocalDOMWindow final : public DOMWindow, public WillBeHeapSupplementable<LocalDOMWindow>, public DOMWindowLifecycleNotifier {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(LocalDOMWindow);
+    WILL_BE_USING_PRE_FINALIZER(LocalDOMWindow, dispose);
 public:
     static PassRefPtrWillBeRawPtr<Document> createDocument(const String& mimeType, const DocumentInit&, bool forceXHTML);
     static PassRefPtrWillBeRawPtr<LocalDOMWindow> create(LocalFrame& frame)
     {
         return adoptRefWillBeNoop(new LocalDOMWindow(frame));
     }
     virtual ~LocalDOMWindow();
+    void dispose();
 
     PassRefPtrWillBeRawPtr<Document> installNewDocument(const String& mimeType, const DocumentInit&, bool forceXHTML = false);
 
     // EventTarget overrides:
     virtual const AtomicString& interfaceName() const override;
     virtual ExecutionContext* executionContext() const override;
     virtual LocalDOMWindow* toDOMWindow() override;
 
     // DOMWindow overrides:
     DECLARE_VIRTUAL_TRACE();
@@ skipping 153 matching lines @@
     };
     friend WTF::OwnedPtrDeleter<WindowFrameObserver>;
 
     explicit LocalDOMWindow(LocalFrame&);
 
     Page* page();
 
     void clearDocument();
     void willDestroyDocumentInFrame();
 
-    // FIXME: Oilpan: the need for this internal method will fall
-    // away when EventTargets are no longer using refcounts and
-    // window properties are also on the heap. Inline the minimal
-    // do-not-broadcast handling then and remove the enum +
-    // removeAllEventListenersInternal().
-    enum BroadcastListenerRemoval {
-        DoNotBroadcastListenerRemoval,
-        DoBroadcastListenerRemoval
-    };
-
     void willDetachFrameHost();
     void frameDestroyed();
-    void removeAllEventListenersInternal(BroadcastListenerRemoval);
 
     OwnPtrWillBeMember<WindowFrameObserver> m_frameObserver;
     RefPtrWillBeMember<Document> m_document;
 
     bool m_shouldPrintWhenFinishedLoading;
 #if ENABLE(ASSERT)
     bool m_hasBeenReset;
 #endif
 
     WillBeHeapHashSet<RawPtrWillBeWeakMember<DOMWindowProperty>> m_properties;
@@ skipping 31 matching lines @@
 }
 
 inline String LocalDOMWindow::defaultStatus() const
 {
     return m_defaultStatus;
 }
 
 } // namespace blink
 
 #endif // LocalDOMWindow_h