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

Source/core/frame/LocalDOMWindow.h

Index: Source/core/frame/LocalDOMWindow.h
diff --git a/Source/core/frame/LocalDOMWindow.h b/Source/core/frame/LocalDOMWindow.h
index 79a2e6d830e591a269a336e7a723dd3bfb615d70..a56785e9498611e5fd51068e297c18d46435b32d 100644
--- a/Source/core/frame/LocalDOMWindow.h
+++ b/Source/core/frame/LocalDOMWindow.h
@@ -63,6 +63,7 @@ enum PageshowEventPersistence {
 // 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)
@@ -70,6 +71,7 @@ public:
         return adoptRefWillBeNoop(new LocalDOMWindow(frame));
     }
     virtual ~LocalDOMWindow();
+    void dispose();
 
     PassRefPtrWillBeRawPtr<Document> installNewDocument(const String& mimeType, const DocumentInit&, bool forceXHTML = false);
 
@@ -243,19 +245,8 @@ private:
     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;