Removing dead code SelectorChecker::checkExactAttribute

Source/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 94 matching lines @@
 
     bool strictParsing() const { return m_strictParsing; }
 
     Mode mode() const { return m_mode; }
 
     static bool tagMatches(const Element&, const QualifiedName&);
     static bool isCommonPseudoClassSelector(const CSSSelector&);
     static bool matchesFocusPseudoClass(const Element&);
     static bool matchesSpatialNavigationFocusPseudoClass(const Element&);
     static bool matchesListBoxPseudoClass(const Element&);
-    static bool checkExactAttribute(const Element&, const QualifiedName& selectorAttributeName, const StringImpl* value);
 
     enum LinkMatchMask { MatchLink = 1, MatchVisited = 2, MatchAll = MatchLink | MatchVisited };
     static unsigned determineLinkMatchType(const CSSSelector&);
 
     static bool isHostInItsShadowTree(const Element&, const ContainerNode* scope);
 
 private:
     template<typename SiblingTraversalStrategy>
     Match matchForSubSelector(const SelectorCheckingContext&, const SiblingTraversalStrategy&, MatchResult*) const;
     template<typename SiblingTraversalStrategy>
@@ skipping 32 matching lines @@
 {
     if (tagQName == anyQName())
         return true;
     const AtomicString& localName = tagQName.localName();
     if (localName != starAtom && localName != element.localName())
         return false;
     const AtomicString& namespaceURI = tagQName.namespaceURI();
     return namespaceURI == starAtom || namespaceURI == element.namespaceURI();
 }
 
-inline bool SelectorChecker::checkExactAttribute(const Element& element, const QualifiedName& selectorAttributeName, const StringImpl* value)
-{
-    for (const auto& attribute : element.attributesWithoutUpdate()) {
-        if (attribute.matches(selectorAttributeName) && (!value || attribute.value().impl() == value))
-            return true;
-    }
-    return false;
-}
-
 inline bool SelectorChecker::isHostInItsShadowTree(const Element& element, const ContainerNode* scope)
 {
     return scope && scope->isInShadowTree() && scope->shadowHost() == element;
 }
 
 }
 
 #endif