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

Source/web/WebNode.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 32 matching lines @@
 #include "WebPluginContainer.h"
 #include "WebPluginContainerImpl.h"
 #include "bindings/v8/ExceptionState.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/Node.h"
 #include "core/dom/NodeList.h"
 #include "core/editing/markup.h"
 #include "core/events/Event.h"
 #include "core/html/HTMLCollection.h"
+#include "core/html/HTMLElement.h"
 #include "core/rendering/RenderObject.h"
 #include "core/rendering/RenderWidget.h"
 #include "platform/Widget.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebVector.h"
 
 using namespace WebCore;
 
 namespace blink {
 
@@ skipping 166 matching lines @@
 bool WebNode::hasNonEmptyBoundingBox() const
 {
     m_private->document().updateLayoutIgnorePendingStylesheets();
     return m_private->hasNonEmptyBoundingBox();
 }
 
 WebPluginContainer* WebNode::pluginContainer() const
 {
     if (isNull())
         return 0;
-    const Node* coreNode = constUnwrap<Node>();
-    if (coreNode->hasTagName(HTMLNames::objectTag) || coreNode->hasTagName(HTMLNames::embedTag)) {
-        RenderObject* object = coreNode->renderer();
+    const Node& coreNode = *constUnwrap<Node>();
+    if (isHTMLObjectElement(coreNode) || isHTMLEmbedElement(coreNode)) {
+        RenderObject* object = coreNode.renderer();
         if (object && object->isWidget()) {
             Widget* widget = WebCore::toRenderWidget(object)->widget();
             if (widget && widget->isPluginContainer())
                 return toWebPluginContainerImpl(widget);
         }
     }
     return 0;
 }
 
 WebElement WebNode::shadowHost() const
@@ skipping 14 matching lines @@
     m_private = node;
     return *this;
 }
 
 WebNode::operator PassRefPtr<Node>() const
 {
     return m_private.get();
 }
 
 } // namespace blink