Remove dead methods from CSSStyleSheet and StyleSheetContents.

sky/engine/core/css/StyleSheetContents.cpp

Index: sky/engine/core/css/StyleSheetContents.cpp
diff --git a/sky/engine/core/css/StyleSheetContents.cpp b/sky/engine/core/css/StyleSheetContents.cpp
index 86fe580fa735d2deaa7e189208c5a61ca42a1a11..5b38d0f2479b560154dc3c9de7406205638738cc 100644
--- a/sky/engine/core/css/StyleSheetContents.cpp
+++ b/sky/engine/core/css/StyleSheetContents.cpp
@@ -61,17 +61,6 @@ void StyleSheetContents::setHasMediaQueries()
     m_hasMediaQueries = true;
 }
 
-StyleRuleBase* StyleSheetContents::ruleAt(unsigned index) const
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(index < ruleCount());
-    return m_childRules[index].get();
-}
-
-unsigned StyleSheetContents::ruleCount() const
-{
-    return m_childRules.size();
-}
-
 bool StyleSheetContents::parseString(const String& sheetText)
 {
     CSSParserContext context(parserContext(), UseCounter::getFrom(this));