| Index: Source/core/frame/UseCounter.h | 
| diff --git a/Source/core/frame/UseCounter.h b/Source/core/frame/UseCounter.h | 
| index a1cfd2ccd3ffcc2a5d87c066cfecaa870d3d817c..8a0526b2b41b18f173ab184e3736286e5fb4ee85 100644 | 
| --- a/Source/core/frame/UseCounter.h | 
| +++ b/Source/core/frame/UseCounter.h | 
| @@ -234,7 +234,6 @@ public: | 
| // The above items are available in M33 branch. | 
|  | 
| InitMessageEvent = 222, | 
| -        PrefixedInitMessageEvent = 223, | 
| ElementSetPrefix = 224, // Element.prefix is readonly in DOM4. | 
| CSSStyleDeclarationGetPropertyCSSValue = 225, | 
| PrefixedMediaCancelKeyRequest = 229, | 
|  |