[net-internals] Remove resolved hostname from UDP_SOCKET event description.

chrome/browser/resources/net_internals/source_entry.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var SourceEntry = (function() {
   'use strict';
 
   /**
    * A SourceEntry gathers all log entries with the same source.
    *
@@ skipping 99 matching lines @@
             this.description_ =
                 SourceTracker.getInstance().getDescription(parentId);
           }
           break;
         case EventSourceType.UDP_SOCKET:
           if (e.params.address != undefined) {
             this.description_ = e.params.address;
             // If the parent of |this| is a HOST_RESOLVER_IMPL_JOB, use
             // '<DNS Server IP> [<host we're resolving>]'.
             if (this.entries_[0].type == EventType.SOCKET_ALIVE &&
+                this.entries_[0].params &&
                 this.entries_[0].params.source_dependency != undefined) {
               var parentId = this.entries_[0].params.source_dependency.id;
               var parent = SourceTracker.getInstance().getSourceEntry(parentId);
               if (parent &&
                   parent.getSourceType() ==
                       EventSourceType.HOST_RESOLVER_IMPL_JOB &&
                   parent.getDescription().length > 0) {
                 this.description_ += ' [' + parent.getDescription() + ']';
               }
             }
@@ skipping 182 matching lines @@
     printAsText: function(parent) {
       // The date will be undefined if not viewing a loaded log file.
       printLogEntriesAsText(this.entries_, parent,
                             SourceTracker.getInstance().getPrivacyStripping(),
                             Constants.clientInfo.numericDate);
     }
   };
 
   return SourceEntry;
 })();