Use new is*Element() helper functions in DOM code

Source/core/dom/PositionIterator.cpp

 /*
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 #include "config.h"
 #include "core/dom/PositionIterator.h"
 
-#include "HTMLNames.h"
 #include "core/editing/htmlediting.h"
+#include "core/html/HTMLHtmlElement.h"
 #include "core/rendering/RenderBlock.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 PositionIterator::operator Position() const
 {
     if (m_nodeAfterPositionInAnchor) {
         ASSERT(m_nodeAfterPositionInAnchor->parentNode() == m_anchorNode);
@@ skipping 110 matching lines @@
 
     if (renderer->isBR())
         return !m_offsetInAnchor && !Position::nodeIsUserSelectNone(m_anchorNode->parentNode());
 
     if (renderer->isText())
         return !Position::nodeIsUserSelectNone(m_anchorNode) && Position(*this).inRenderedText();
 
     if (isRenderedTableElement(m_anchorNode) || editingIgnoresContent(m_anchorNode))
         return (atStartOfNode() || atEndOfNode()) && !Position::nodeIsUserSelectNone(m_anchorNode->parentNode());
 
-    if (!m_anchorNode->hasTagName(htmlTag) && renderer->isRenderBlockFlow()) {
-        if (toRenderBlock(renderer)->logicalHeight() || m_anchorNode->hasTagName(bodyTag)) {
+    if (!isHTMLHtmlElement(*m_anchorNode) && renderer->isRenderBlockFlow()) {
+        if (toRenderBlock(renderer)->logicalHeight() || isHTMLBodyElement(*m_anchorNode)) {
             if (!Position::hasRenderedNonAnonymousDescendantsWithHeight(renderer))
                 return atStartOfNode() && !Position::nodeIsUserSelectNone(m_anchorNode);
             return m_anchorNode->rendererIsEditable() && !Position::nodeIsUserSelectNone(m_anchorNode) && Position(*this).atEditingBoundary();
         }
     }
 
     return false;
 }
 
 } // namespace WebCore