Correctly handle object classname and add Symbol type to PropertyPreview and CallArgument in the pr…

Source/core/inspector/InjectedScriptSource.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2013 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 1059 matching lines @@
 
         return;
     }
 
     object = /** @type {Object} */ (object);
 
     this.objectId = injectedScript._bind(object, objectGroupName);
     var subtype = injectedScript._subtype(object);
     if (subtype)
         this.subtype = subtype;
-    this.className = InjectedScriptHost.internalConstructorName(object);
+    var className = InjectedScriptHost.internalConstructorName(object);
+    if (className)
+        this.className = className;
     this.description = injectedScript._describe(object);
 
     if (generatePreview && (this.type === "object" || injectedScript._isHTMLAllCollection(object)))
         this.preview = this._generatePreview(object, undefined, columnNames, isTable, false);
 }
 
 InjectedScript.RemoteObject.prototype = {
     /**
      * @param {Object} object
      * @param {Array.<string>=} firstLevelKeys
@@ skipping 538 matching lines @@
      */
     _logEvent: function(event)
     {
         inspectedWindow.console.log(event.type, event);
     }
 }
 
 injectedScript._commandLineAPIImpl = new CommandLineAPIImpl();
 return injectedScript;
 })