| Index: Source/core/dom/TreeWalker.idl | 
| diff --git a/Source/core/dom/TreeWalker.idl b/Source/core/dom/TreeWalker.idl | 
| index 93b7d77d33d9f367513d9e12a8377c2be7c3e4e7..2fb6eb58a91b13612dfbecbc75d7b4b41498b015 100644 | 
| --- a/Source/core/dom/TreeWalker.idl | 
| +++ b/Source/core/dom/TreeWalker.idl | 
| @@ -21,6 +21,7 @@ | 
| // Introduced in DOM Level 2 | 
| [ | 
| SetWrapperReferenceTo(NodeFilter filter), | 
| +    WillBeGarbageCollected, | 
| ] interface TreeWalker { | 
| readonly attribute Node root; | 
| readonly attribute unsigned long whatToShow; | 
|  |