| Index: third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.cpp
 | 
| diff --git a/third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.cpp b/third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.cpp
 | 
| index 0e9fb986ac4b248e3d095790b443e4d0ebf698e0..5ef0b40a8f9c2d762d368cf80418afd855bc4b8f 100644
 | 
| --- a/third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.cpp
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| +++ b/third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.cpp
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| @@ -16,4 +16,9 @@ CustomElementDefinition::~CustomElementDefinition()
 | 
|  {
 | 
|  }
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|  
 | 
| +DEFINE_TRACE(CustomElementDefinition)
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| +{
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| +    visitor->trace(m_constructionStack);
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| +}
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| +
 | 
|  } // namespace blink
 | 
| 
 |