Devtools: Don't clear custom user agent on double click

third_party/WebKit/Source/devtools/front_end/network/NetworkConfigView.js

 // Copyright (c) 2015 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.
 
 /**
  * @constructor
  * @extends {WebInspector.VBox}
  */
 WebInspector.NetworkConfigView = function()
 {
@@ skipping 139 matching lines @@
     }
 
     function textKeyDown(event)
     {
         if (isEnterKey(event))
             textChanged();
     }
 
     function textDoubleClicked()
     {
+        if (userAgentSelectElement.selectedIndex === userAgents.length - 1)
+            return;
         userAgentSelectElement.selectedIndex = userAgents.length - 1;
         userAgentSelected();
     }
 
     function textChanged()
     {
         if (userAgentSetting.get() !== otherUserAgentElement.value) {
             userAgentSetting.set(otherUserAgentElement.value);
             settingChanged();
         }
@@ skipping 52 matching lines @@
      * @param {!WebInspector.Context} context
      * @param {string} actionId
      * @return {boolean}
      */
     handleAction: function(context, actionId)
     {
         WebInspector.inspectorView.showViewInDrawer("network.config");
         return true;
     }
 }