Revert of Remove WebElement::hasTagName.

Source/web/WebElement.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 44 matching lines @@
 bool WebElement::isTextFormControlElement() const
 {
     return constUnwrap<Element>()->isTextFormControl();
 }
 
 WebString WebElement::tagName() const
 {
     return constUnwrap<Element>()->tagName();
 }
 
+bool WebElement::hasTagName(const WebString& tagName) const
+{
+    return equalIgnoringCase(constUnwrap<Element>()->tagName(),
+                             tagName.operator String());
+}
+
 bool WebElement::hasHTMLTagName(const WebString& tagName) const
 {
     // How to create                     class              nodeName localName
     // createElement('input')            HTMLInputElement   INPUT    input
     // createElement('INPUT')            HTMLInputElement   INPUT    input
     // createElementNS(xhtmlNS, 'input') HTMLInputElement   INPUT    input
     // createElementNS(xhtmlNS, 'INPUT') HTMLUnknownElement INPUT    INPUT
     const Element* element = constUnwrap<Element>();
     return HTMLNames::xhtmlNamespaceURI == element->namespaceURI() && element->localName() == String(tagName).lower();
 }
@@ skipping 101 matching lines @@
     m_private = elem;
     return *this;
 }
 
 WebElement::operator PassRefPtrWillBeRawPtr<Element>() const
 {
     return toElement(m_private.get());
 }
 
 } // namespace blink