Bug 1430014 - Part 4: #ifdef out unnecessary code when the old style system is not built. r=xidorn

MozReview-Commit-ID: 1FZ9VzjcPzN

dom/html/HTMLTableCellElement.h

@@ -142,7 +142,9 @@ public:
                               nsIPrincipal* aMaybeScriptedPrincipal,
                               nsAttrValue& aResult) override;
   virtual nsMapRuleToAttributesFunc GetAttributeMappingFunction() const override;
+#ifdef MOZ_OLD_STYLE
   NS_IMETHOD WalkContentStyleRules(nsRuleWalker* aRuleWalker) override;
+#endif
   NS_IMETHOD_(bool) IsAttributeMapped(const nsAtom* aAttribute) const override;
   // Get mapped attributes of ancestor table, if any
   nsMappedAttributes* GetMappedAttributesInheritedFromTable() const;