DevTools: make disable javascript setting temporary

third_party/WebKit/Source/devtools/front_end/shell/TestShell.js

 // Copyright 2016 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.
 
 Shell.TestShell = class {
   /**
    * @suppressGlobalPropertiesCheck
    */
   constructor() {
     runOnWindowLoad(this.initializeUnitTest.bind(this));
   }
 
   /**
    * @suppressGlobalPropertiesCheck
    */
   initializeUnitTest() {
     var globalStorage = new Common.SettingsStorage(
         {}, InspectorFrontendHost.setPreference, InspectorFrontendHost.removePreference,
         InspectorFrontendHost.clearPreferences);
     var storagePrefix = '';
     var localStorage = new Common.SettingsStorage({}, undefined, undefined, undefined, storagePrefix);
-    Common.settings = new Common.Settings(globalStorage, localStorage);
+    var sessionStorage = new Common.SettingsStorage({}, undefined, undefined, undefined, storagePrefix);
+    Common.settings = new Common.Settings(globalStorage, localStorage, sessionStorage);
 
     UI.viewManager = new UI.ViewManager();
     UI.initializeUIUtils(document, Common.settings.createSetting('uiTheme', 'default'));
     UI.installComponentRootStyles(/** @type {!Element} */ (document.body));
 
     UI.zoomManager = new UI.ZoomManager(self, InspectorFrontendHost);
     UI.inspectorView = UI.InspectorView.instance();
     UI.ContextMenu.initialize();
     UI.ContextMenu.installHandler(document);
     UI.Tooltip.installHandler(document);
 
     var rootView = new UI.RootView();
     UI.inspectorView.show(rootView.element);
     rootView.attachToDocument(document);
     TestRunner.executeTestScript();
   }
 };
 
 new Shell.TestShell();