Drop slower Node::hasTagName(QualifiedName) overload

Drop slower Node::hasTagName(QualifiedName) overload. It is only used by
SiblingTraversalStrategies at this point. The objective is to encourage
future callers to use the faster alternatives:
- HTMLElement::hasTagName(HTMLQualifiedName) / SVGElement::hasTagName(SVGQualifiedName)
- Node::hasTagName(HTMLQualifiedName) / Node::hasTagName(SVGQualifiedName)
- Element::hasTagName(QualifiedName)

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/415823002

git-svn-id: svn://svn.chromium.org/blink/trunk@179165 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/css/SiblingTraversalStrategies.h

@@ -168,7 +168,7 @@ inline bool ShadowDOMSiblingTraversalStrategy::isFirstOfType(Element& element, c
     ASSERT(element == toElement(m_siblings[m_nth]));
 
     for (int i = m_nth - 1; i >= 0; --i) {
-        if (m_siblings[i]->hasTagName(type))
+        if (m_siblings[i]->isElementNode() && toElement(m_siblings[i])->hasTagName(type))
             return false;
     }
 
@@ -180,7 +180,7 @@ inline bool ShadowDOMSiblingTraversalStrategy::isLastOfType(Element& element, co
     ASSERT(element == toElement(m_siblings[m_nth]));
 
     for (size_t i = m_nth + 1; i < m_siblings.size(); ++i) {
-        if (m_siblings[i]->hasTagName(type))
+        if (m_siblings[i]->isElementNode() && toElement(m_siblings[i])->hasTagName(type))
             return false;
     }
 
@@ -219,7 +219,7 @@ inline int ShadowDOMSiblingTraversalStrategy::countElementsOfTypeBefore(Element&
 
     int count = 0;
     for (int i = m_nth - 1; i >= 0; --i) {
-        if (m_siblings[i]->hasTagName(type))
+        if (m_siblings[i]->isElementNode() && toElement(m_siblings[i])->hasTagName(type))
             ++count;
     }
 
@@ -232,7 +232,7 @@ inline int ShadowDOMSiblingTraversalStrategy::countElementsOfTypeAfter(Element&
 
     int count = 0;
     for (size_t i = m_nth + 1; i < m_siblings.size(); ++i) {
-        if (m_siblings[i]->hasTagName(type))
+        if (m_siblings[i]->isElementNode() && toElement(m_siblings[i])->hasTagName(type))
             return ++count;
     }
 

third_party/WebKit/Source/core/dom/Element.h

@@ -685,11 +685,6 @@ inline bool isDisabledFormControl(const Node* node)
     return node->isElementNode() && toElement(node)->isDisabledFormControl();
 }
 
-inline bool Node::hasTagName(const QualifiedName& name) const
-{
-    return isElementNode() && toElement(this)->hasTagName(name);
-}
-
 inline Element* Node::parentElement() const
 {
     ContainerNode* parent = parentNode();

third_party/WebKit/Source/core/dom/Node.h

@@ -171,7 +171,6 @@ public:
 
     // DOM methods & attributes for Node
 
-    bool hasTagName(const QualifiedName&) const;
     bool hasTagName(const HTMLQualifiedName&) const;
     bool hasTagName(const SVGQualifiedName&) const;
     virtual String nodeName() const = 0;