Removed StyleEngine::m_usesSiblingRulesOverride.

Source/core/dom/StyleEngine.h

Index: Source/core/dom/StyleEngine.h
diff --git a/Source/core/dom/StyleEngine.h b/Source/core/dom/StyleEngine.h
index 3732e6df9e8fa5329e725e57885c1b759938b144..2ac3a442097e769d5d739f7b0f81a990ee636056 100644
--- a/Source/core/dom/StyleEngine.h
+++ b/Source/core/dom/StyleEngine.h
@@ -119,8 +119,7 @@ public:
     bool ignoringPendingStylesheets() const { return m_ignorePendingStylesheets; }
 
     unsigned maxDirectAdjacentSelectors() const { return m_maxDirectAdjacentSelectors; }
-    bool usesSiblingRules() const { return m_usesSiblingRules || m_usesSiblingRulesOverride; }
-    void setUsesSiblingRulesOverride(bool b) { m_usesSiblingRulesOverride = b; }
+    bool usesSiblingRules() const { return m_usesSiblingRules; }
     bool usesFirstLineRules() const { return m_usesFirstLineRules; }
     bool usesFirstLetterRules() const { return m_usesFirstLetterRules; }
     void setUsesFirstLetterRules(bool b) { m_usesFirstLetterRules = b; }
@@ -236,7 +235,6 @@ private:
     String m_selectedStylesheetSetName;
 
     bool m_usesSiblingRules;
-    bool m_usesSiblingRulesOverride;
     bool m_usesFirstLineRules;
     bool m_usesFirstLetterRules;
     bool m_usesRemUnits;