Remove more oilpan.

sky/engine/core/css/CSSDefaultStyleSheets.cpp

Index: sky/engine/core/css/CSSDefaultStyleSheets.cpp
diff --git a/sky/engine/core/css/CSSDefaultStyleSheets.cpp b/sky/engine/core/css/CSSDefaultStyleSheets.cpp
index 518b1f1c2cc3de03021135a3598dd64392181e4d..7471b99054f3b97b57f3a84bc625a6ea3c58b722 100644
--- a/sky/engine/core/css/CSSDefaultStyleSheets.cpp
+++ b/sky/engine/core/css/CSSDefaultStyleSheets.cpp
@@ -83,16 +83,4 @@ CSSDefaultStyleSheets::CSSDefaultStyleSheets()
     m_defaultViewportStyle->addRulesFromSheet(viewportStyleSheet(), screenEval());
 }
 
-void CSSDefaultStyleSheets::ensureDefaultStyleSheetsForElement(Element* element, bool& changedDefaultStyle)
-{
-}
-
-void CSSDefaultStyleSheets::trace(Visitor* visitor)
-{
-    visitor->trace(m_defaultStyle);
-    visitor->trace(m_defaultViewportStyle);
-    visitor->trace(m_defaultStyleSheet);
-    visitor->trace(m_viewportStyleSheet);
-}
-
 } // namespace blink