Use new is*Element() helper functions in page/ code

Source/core/page/FocusController.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * 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 598 matching lines @@
         return;
 
     if (Node* mousePressNode = newFocusedFrame->eventHandler().mousePressNode()) {
         if (mousePressNode->renderer() && !mousePressNode->canStartSelection()) {
             // Don't clear the selection for contentEditable elements, but do clear it for input and textarea. See bug 38696.
             Node* root = selection.rootEditableElement();
             if (!root)
                 return;
 
             if (Node* shadowAncestorNode = root->deprecatedShadowAncestorNode()) {
-                if (!shadowAncestorNode->hasTagName(inputTag) && !shadowAncestorNode->hasTagName(textareaTag))
+                if (!isHTMLInputElement(*shadowAncestorNode) && !isHTMLTextAreaElement(*shadowAncestorNode))
                     return;
             }
         }
     }
 
     selection.clear();
 }
 
 bool FocusController::setFocusedElement(Element* element, PassRefPtr<LocalFrame> newFocusedFrame, FocusType type)
 {
@@ skipping 254 matching lines @@
 
     if (container->isDocumentNode())
         toDocument(container)->updateLayoutIgnorePendingStylesheets();
 
     // Figure out the starting rect.
     LayoutRect startingRect;
     if (focusedElement) {
         if (!hasOffscreenRect(focusedElement)) {
             container = scrollableEnclosingBoxOrParentFrameForNodeInDirection(type, focusedElement);
             startingRect = nodeRectInAbsoluteCoordinates(focusedElement, true /* ignore border */);
-        } else if (focusedElement->hasTagName(areaTag)) {
-            HTMLAreaElement* area = toHTMLAreaElement(focusedElement);
-            container = scrollableEnclosingBoxOrParentFrameForNodeInDirection(type, area->imageElement());
+        } else if (isHTMLAreaElement(*focusedElement)) {
+            HTMLAreaElement& area = toHTMLAreaElement(*focusedElement);
+            container = scrollableEnclosingBoxOrParentFrameForNodeInDirection(type, area.imageElement());
             startingRect = virtualRectForAreaElementAndDirection(area, type);
         }
     }
 
     bool consumed = false;
     do {
         consumed = advanceFocusDirectionallyInContainer(container, startingRect, type);
         startingRect = nodeRectInAbsoluteCoordinates(container, true /* ignore border */);
         container = scrollableEnclosingBoxOrParentFrameForNodeInDirection(type, container);
         if (container && container->isDocumentNode())
             toDocument(container)->updateLayoutIgnorePendingStylesheets();
     } while (!consumed && container);
 
     return consumed;
 }
 
 } // namespace WebCore