Use new is*Element() helper functions more in HTML code

Source/core/html/parser/HTMLElementStack.cpp

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  * Copyright (C) 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 13 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/html/parser/HTMLElementStack.h"
 
 #include "HTMLNames.h"
 #include "MathMLNames.h"
 #include "SVGNames.h"
 #include "core/dom/Element.h"
+#include "core/html/HTMLElement.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 
 namespace {
 
 inline bool isRootNode(HTMLStackItem* item)
 {
@@ skipping 349 matching lines @@
     if (m_top->element() == element) {
         popHTMLHeadElement();
         return;
     }
     m_headElement = 0;
     removeNonTopCommon(element);
 }
 
 void HTMLElementStack::remove(Element* element)
 {
-    ASSERT(!element->hasTagName(HTMLNames::headTag));
+    ASSERT(!isHTMLHeadElement(element));
     if (m_top->element() == element) {
         pop();
         return;
     }
     removeNonTopCommon(element);
 }
 
 HTMLElementStack::ElementRecord* HTMLElementStack::find(Element* element) const
 {
     for (ElementRecord* pos = m_top.get(); pos; pos = pos->next()) {
@@ skipping 155 matching lines @@
     ASSERT(!topStackItem()->hasTagName(headTag) || !m_headElement);
     ASSERT(!topStackItem()->hasTagName(bodyTag) || !m_bodyElement);
     top()->finishParsingChildren();
     m_top = m_top->releaseNext();
 
     m_stackDepth--;
 }
 
 void HTMLElementStack::removeNonTopCommon(Element* element)
 {
-    ASSERT(!element->hasTagName(htmlTag));
-    ASSERT(!element->hasTagName(bodyTag));
+    ASSERT(!isHTMLHtmlElement(element));
+    ASSERT(!isHTMLBodyElement(element));
     ASSERT(top() != element);
     for (ElementRecord* pos = m_top.get(); pos; pos = pos->next()) {
         if (pos->next()->element() == element) {
             // FIXME: Is it OK to call finishParsingChildren()
             // when the children aren't actually finished?
             element->finishParsingChildren();
             pos->setNext(pos->next()->releaseNext());
             m_stackDepth--;
             return;
         }
@@ skipping 18 matching lines @@
 
 void HTMLElementStack::show()
 {
     for (ElementRecord* record = m_top.get(); record; record = record->next())
         record->element()->showNode();
 }
 
 #endif
 
 }