| Index: Source/core/dom/DocumentLifecycleNotifier.cpp
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| diff --git a/Source/core/dom/DocumentLifecycleNotifier.cpp b/Source/core/dom/DocumentLifecycleNotifier.cpp
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| index 39a4c2d47d9d424537556e26fefb62763bf9358c..387ef8d2588bd009ccd096129e39441a9feddd3c 100644
 | 
| --- a/Source/core/dom/DocumentLifecycleNotifier.cpp
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| +++ b/Source/core/dom/DocumentLifecycleNotifier.cpp
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| @@ -73,4 +73,10 @@ void DocumentLifecycleNotifier::notifyDocumentWasDisposed()
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|  }
 | 
|  #endif
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|  
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| +void DocumentLifecycleNotifier::trace(Visitor* visitor)
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| +{
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| +    visitor->trace(m_documentObservers);
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| +    LifecycleNotifier<Document>::trace(visitor);
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| +}
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| +
 | 
|  } // namespace blink
 | 
| 
 |