Don't scope check in SelectorChecker.

sky/engine/core/css/SelectorChecker.h

Index: sky/engine/core/css/SelectorChecker.h
diff --git a/sky/engine/core/css/SelectorChecker.h b/sky/engine/core/css/SelectorChecker.h
index 004d03b42d39a62314175de0ce042cd775f47bf9..2e89aa46da8aa8427759b1095bca5d28116d8730 100644
--- a/sky/engine/core/css/SelectorChecker.h
+++ b/sky/engine/core/css/SelectorChecker.h
@@ -41,19 +41,16 @@ class SelectorChecker {
 public:
     explicit SelectorChecker(const Element&);
 
-    // TODO(esprehn): scope should never be null.
-    bool match(const CSSSelector&, const ContainerNode* scope);
+    bool match(const CSSSelector&);
 
     bool matchedAttributeSelector() const { return m_matchedAttributeSelector; }
     bool matchedFocusSelector() const { return m_matchedFocusSelector; }
     bool matchedHoverSelector() const { return m_matchedHoverSelector; }
     bool matchedActiveSelector() const { return m_matchedActiveSelector; }
 
-    static bool isHostInItsShadowTree(const Element&, const ContainerNode* scope);
-
 private:
-    bool checkPseudoClass(const CSSSelector&, const ContainerNode* scope);
-    bool checkOne(const CSSSelector&, const ContainerNode* scope);
+    bool checkPseudoClass(const CSSSelector&);
+    bool checkOne(const CSSSelector&);
 
     const Element& m_element;
     bool m_matchedAttributeSelector;
@@ -62,11 +59,6 @@ private:
     bool m_matchedActiveSelector;
 };
 
-inline bool SelectorChecker::isHostInItsShadowTree(const Element& element, const ContainerNode* scope)
-{
-    return scope && scope->isInShadowTree() && scope->shadowHost() == element;
-}
-
 }
 
 #endif  // SKY_ENGINE_CORE_CSS_SELECTORCHECKER_H_