Don't scope check in SelectorChecker.

sky/engine/core/css/SelectorChecker.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 23 matching lines @@
 
 class CSSSelector;
 class ContainerNode;
 class Element;
 
 class SelectorChecker {
     WTF_MAKE_NONCOPYABLE(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;
     bool m_matchedFocusSelector;
     bool m_matchedHoverSelector;
     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_