DevTools: Fix console not showing array items inherited from prototype.

Source/devtools/front_end/sdk/RemoteObject.js

 /*
  * 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 172 matching lines @@
         return "null";
 
     var type = typeof remoteObject;
     if (type !== "object" && type !== "function")
         return type;
 
     return remoteObject.type;
 }
 
 /**
+ * @param {!WebInspector.RemoteObject|!RuntimeAgent.RemoteObject|!RuntimeAgent.ObjectPreview} object
+ * @return {number}
+ */
+WebInspector.RemoteObject.arrayLength = function(object)
+{
+    if (object.subtype !== "array")
+        return 0;
+    var matches = object.description.match(/\[([0-9]+)\]/);
+    if (!matches)
+        return 0;
+    return parseInt(matches[1], 10);
+}
+
+/**
  * @param {!RuntimeAgent.RemoteObject|!WebInspector.RemoteObject|number|string|boolean|undefined|null} object
  * @return {!RuntimeAgent.CallArgument}
  */
 WebInspector.RemoteObject.toCallArgument = function(object)
 {
     var type = typeof object;
     var value = object;
     var objectId = undefined;
     var description = String(object);
 
@@ skipping 414 matching lines @@
             return;
         this._runtimeAgent.releaseObject(this._objectId);
     },
 
     /**
      * @override
      * @return {number}
      */
     arrayLength: function()
     {
-        if (this.subtype !== "array")
-            return 0;
-
-        var matches = this._description.match(/\[([0-9]+)\]/);
-        if (!matches)
-            return 0;
-        return parseInt(matches[1], 10);
+        return WebInspector.RemoteObject.arrayLength(this);
     },
 
     /**
      * @override
      * @return {!WebInspector.Target}
      */
     target: function()
     {
         return this._target;
     },
@@ skipping 541 matching lines @@
     {
         if (!this._cachedDescription) {
             var children = this._children();
             this._cachedDescription = "{" + this._formatValue(children[0].value) + " => " + this._formatValue(children[1].value) + "}";
         }
         return this._cachedDescription;
     },
 
     __proto__: WebInspector.LocalJSONObject.prototype
 }