Introduce HasHTMLTagName functor and use it with ElementTraversal

Source/core/html/HTMLTableElement.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 60 matching lines @@
 }
 
 void HTMLTableElement::setCaption(PassRefPtrWillBeRawPtr<HTMLTableCaptionElement> newCaption, ExceptionState& exceptionState)
 {
     deleteCaption();
     insertBefore(newCaption, firstChild(), exceptionState);
 }
 
 HTMLTableSectionElement* HTMLTableElement::tHead() const
 {
-    for (HTMLElement* child = Traversal<HTMLElement>::firstChild(*this); child; child = Traversal<HTMLElement>::nextSibling(*child)) {
-        if (child->hasTagName(theadTag))
-            return toHTMLTableSectionElement(child);
-    }
-    return 0;
+    return toHTMLTableSectionElement(Traversal<HTMLElement>::firstChild(*this, HasHTMLTagName(theadTag)));
 }
 
 void HTMLTableElement::setTHead(PassRefPtrWillBeRawPtr<HTMLTableSectionElement> newHead, ExceptionState& exceptionState)
 {
     deleteTHead();
 
     HTMLElement* child;
     for (child = Traversal<HTMLElement>::firstChild(*this); child; child = Traversal<HTMLElement>::nextSibling(*child)) {
         if (!child->hasTagName(captionTag) && !child->hasTagName(colgroupTag))
             break;
     }
 
     insertBefore(newHead, child, exceptionState);
 }
 
 HTMLTableSectionElement* HTMLTableElement::tFoot() const
 {
-    for (HTMLElement* child = Traversal<HTMLElement>::firstChild(*this); child; child = Traversal<HTMLElement>::nextSibling(*child)) {
-        if (child->hasTagName(tfootTag))
-            return toHTMLTableSectionElement(child);
-    }
-    return 0;
+    return toHTMLTableSectionElement(Traversal<HTMLElement>::firstChild(*this, HasHTMLTagName(tfootTag)));
 }
 
 void HTMLTableElement::setTFoot(PassRefPtrWillBeRawPtr<HTMLTableSectionElement> newFoot, ExceptionState& exceptionState)
 {
     deleteTFoot();
 
     HTMLElement* child;
     for (child = Traversal<HTMLElement>::firstChild(*this); child; child = Traversal<HTMLElement>::nextSibling(*child)) {
         if (!child->hasTagName(captionTag) && !child->hasTagName(colgroupTag) && !child->hasTagName(theadTag))
             break;
@@ skipping 48 matching lines @@
     return caption.release();
 }
 
 void HTMLTableElement::deleteCaption()
 {
     removeChild(caption(), IGNORE_EXCEPTION);
 }
 
 HTMLTableSectionElement* HTMLTableElement::lastBody() const
 {
-    for (HTMLElement* child = Traversal<HTMLElement>::lastChild(*this); child; child = Traversal<HTMLElement>::previousSibling(*child)) {
-        if (child->hasTagName(tbodyTag))
-            return toHTMLTableSectionElement(child);
-    }
-    return 0;
+    return toHTMLTableSectionElement(Traversal<HTMLElement>::lastChild(*this, HasHTMLTagName(tbodyTag)));
 }
 
 PassRefPtrWillBeRawPtr<HTMLElement> HTMLTableElement::insertRow(ExceptionState& exceptionState)
 {
     // The default 'index' argument value is -1.
     return insertRow(-1, exceptionState);
 }
 
 PassRefPtrWillBeRawPtr<HTMLElement> HTMLTableElement::insertRow(int index, ExceptionState& exceptionState)
 {
@@ skipping 386 matching lines @@
     return getAttribute(summaryAttr);
 }
 
 void HTMLTableElement::trace(Visitor* visitor)
 {
     visitor->trace(m_sharedCellStyle);
     HTMLElement::trace(visitor);
 }
 
 }