| Index: Source/core/frame/DOMWindowLifecycleNotifier.cpp
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| diff --git a/Source/core/frame/DOMWindowLifecycleNotifier.cpp b/Source/core/frame/DOMWindowLifecycleNotifier.cpp
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| index 678c0836e9abc6c7a37227a58e8ab2abd55e8f08..471641929502775677521a85c972df28d3aecfb8 100644
 | 
| --- a/Source/core/frame/DOMWindowLifecycleNotifier.cpp
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| +++ b/Source/core/frame/DOMWindowLifecycleNotifier.cpp
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| @@ -77,4 +77,10 @@ void DOMWindowLifecycleNotifier::notifyRemoveAllEventListeners(LocalDOMWindow* w
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|          windowObserver->didRemoveAllEventListeners(window);
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|  }
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|  
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| +void DOMWindowLifecycleNotifier::trace(Visitor* visitor)
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| +{
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| +    visitor->trace(m_windowObservers);
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| +    LifecycleNotifier<LocalDOMWindow>::trace(visitor);
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| +}
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| +
 | 
|  } // namespace blink
 | 
| 
 |