DevTools: Move DOMNode.appropriateSelectorFor() into DOMPresentationUtil.

Source/devtools/front_end/DOMPresentationUtils.js

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
@@ skipping 140 matching lines @@
             else
                 description = WebInspector.UIString("%d \xd7 %d pixels (Natural: %d \xd7 %d pixels)", offsetWidth, offsetHeight, naturalWidth, naturalHeight);
         }
 
         container.createChild("tr").createChild("td", "image-container").appendChild(imageElement);
         if (description)
             container.createChild("tr").createChild("td").createChild("span", "description").textContent = description;
         userCallback(container);
     }
 }
+
+/**
+ * @param {!WebInspector.DOMNode} node
+ * @param {boolean=} justSelector
+ * @return {string}
+ */
+WebInspector.DOMPresentationUtils.appropriateSelectorFor = function(node, justSelector)
+{
+    var lowerCaseName = node.localName() || node.nodeName().toLowerCase();
+
+    var id = node.getAttribute("id");
+    if (id) {
+        var selector = "#" + id;
+        return (justSelector ? selector : lowerCaseName + selector);
+    }
+
+    var className = node.getAttribute("class");
+    if (className) {
+        var selector = "." + className.trim().replace(/\s+/g, ".");
+        return (justSelector ? selector : lowerCaseName + selector);
+    }
+
+    if (lowerCaseName === "input" && node.getAttribute("type"))
+        return lowerCaseName + "[type=\"" + node.getAttribute("type") + "\"]";
+
+    return lowerCaseName;
+}