Remove Element#attributes.

sky/framework/inspector/dom-agent.sky

 <script>
 function DOMAgent(delegate) {
   this.enabled = false;
   this.delegate_ = delegate;
   this.nextNodeId_ = 1;
   this.nodeToId_ = new Map();
   this.idToNode_ = new Map();
 }
 
 DOMAgent.prototype.getIdForNode_ = function(node) {
@@ skipping 14 matching lines @@
   for (var child = node.firstChild; child; child = child.nextSibling) {
     var record = this.serializeNode_(child);
     if (record)
       children.push(record);
   }
   return children;
 };
 
 DOMAgent.prototype.serializeAttributes_ = function(element) {
   var attributes = [];
-  var attrs = element.attributes;
+  var attrs = element.getAttributes();
   for (var i = 0; i < attrs.length; ++i) {
     var attr = attrs[i];
     attributes.push(attr.name);
     attributes.push(attr.value);
   }
   return attributes;
 };
 
 DOMAgent.prototype.serializeNode_ = function(node) {
   var id = this.getIdForNode_(node);
@@ skipping 114 matching lines @@
           previousNodeId: previousNodeId,
           node: this.serializeNode_(node),
         });
       }.bind(this));
     }
   }
 };
 
 module.exports = DOMAgent;
 </script>