Remove hasSyntacticallyValidCSSHeader.

sky/engine/core/css/StyleSheetContents.h

Index: sky/engine/core/css/StyleSheetContents.h
diff --git a/sky/engine/core/css/StyleSheetContents.h b/sky/engine/core/css/StyleSheetContents.h
index 375fd73105f938ccad5a74bf3d1d1494b9632808..a0e9445f6b033a3359f5b26bd8026b575687563c 100644
--- a/sky/engine/core/css/StyleSheetContents.h
+++ b/sky/engine/core/css/StyleSheetContents.h
@@ -69,9 +69,6 @@ public:
 
     KURL completeURL(const String& url) const;
 
-    void setHasSyntacticallyValidCSSHeader(bool isValidCss);
-    bool hasSyntacticallyValidCSSHeader() const { return m_hasSyntacticallyValidCSSHeader; }
-
     void parserAppendRule(PassRefPtr<StyleRuleBase>);
     void parserSetUsesRemUnits(bool b) { m_usesRemUnits = b; }
 
@@ -113,7 +110,6 @@ private:
 
     Document* clientSingleOwnerDocument() const;
 
-    bool m_hasSyntacticallyValidCSSHeader : 1;
     bool m_usesRemUnits : 1;
     bool m_hasMediaQueries : 1;
     bool m_hasSingleOwnerDocument : 1;