Drop slower Node::hasID() / Node::hasClass() methods

Source/core/rendering/RenderTreeAsText.cpp

Index: Source/core/rendering/RenderTreeAsText.cpp
diff --git a/Source/core/rendering/RenderTreeAsText.cpp b/Source/core/rendering/RenderTreeAsText.cpp
index 9544a0e622f2031ebe03b70f7d96da8405956436..3905d7bff748d71e5e8cf938d4d7f63a8299fdfc 100644
--- a/Source/core/rendering/RenderTreeAsText.cpp
+++ b/Source/core/rendering/RenderTreeAsText.cpp
@@ -348,17 +348,18 @@ void RenderTreeAsText::writeRenderObject(TextStream& ts, const RenderObject& o,
     }
 
     if (behavior & RenderAsTextShowIDAndClass) {
-        if (Node* node = o.node()) {
-            if (node->hasID())
-                ts << " id=\"" + toElement(node)->getIdAttribute() + "\"";
+        Node* node = o.node();
+        if (node && node->isElementNode()) {
+            Element& element = toElement(*node);
+            if (element.hasID())
+                ts << " id=\"" + element.getIdAttribute() + "\"";
 
-            if (node->hasClass()) {
+            if (element.hasClass()) {
                 ts << " class=\"";
-                Element* element = toElement(node);
-                for (size_t i = 0; i < element->classNames().size(); ++i) {
+                for (size_t i = 0; i < element.classNames().size(); ++i) {
                     if (i > 0)
                         ts << " ";
-                    ts << element->classNames()[i];
+                    ts << element.classNames()[i];
                 }
                 ts << "\"";
             }