| Index: Source/core/css/CSSStyleSheet.h
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| diff --git a/Source/core/css/CSSStyleSheet.h b/Source/core/css/CSSStyleSheet.h
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| index 176061f5a7de7036a84c85d8d61b3473751ba071..2b91f05806a427842d2b35ae4177f3bdd1af37f5 100644
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| --- a/Source/core/css/CSSStyleSheet.h
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| +++ b/Source/core/css/CSSStyleSheet.h
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| @@ -21,6 +21,7 @@
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|  #ifndef CSSStyleSheet_h
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|  #define CSSStyleSheet_h
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|  
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| +#include "bindings/core/v8/Optional.h"
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|  #include "core/css/CSSRule.h"
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|  #include "core/css/StyleSheet.h"
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|  #include "platform/heap/Handle.h"
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| @@ -71,8 +72,7 @@ public:
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|  
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|      // IE Extensions
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|      PassRefPtrWillBeRawPtr<CSSRuleList> rules();
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| -    int addRule(const String& selector, const String& style, int index, ExceptionState&);
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| -    int addRule(const String& selector, const String& style, ExceptionState&);
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| +    int addRule(const String& selector, const String& style, Optional<int> index, ExceptionState&);
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|      void removeRule(unsigned index, ExceptionState& exceptionState) { deleteRule(index, exceptionState); }
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|  
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|      // For CSSRuleList.
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| 
 |