DevTools: make disable javascript setting temporary

third_party/WebKit/Source/devtools/front_end/main/Main.js

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2007 Matt Lilek (pewtermoose@gmail.com).
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 65 matching lines @@
     if (Host.isCustomDevtoolsFrontend())
       storagePrefix = '__custom__';
     else if (!Runtime.queryParam('can_dock') && !!Runtime.queryParam('debugFrontend') && !Host.isUnderTest(prefs))
       storagePrefix = '__bundled__';
     var clearLocalStorage = window.localStorage ? window.localStorage.clear.bind(window.localStorage) : undefined;
     var localStorage =
         new Common.SettingsStorage(window.localStorage || {}, undefined, undefined, clearLocalStorage, storagePrefix);
     var globalStorage = new Common.SettingsStorage(
         prefs, InspectorFrontendHost.setPreference, InspectorFrontendHost.removePreference,
         InspectorFrontendHost.clearPreferences, 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);
     if (!Host.isUnderTest(prefs))
       new Common.VersionController().updateVersion();
   }
 
   /**
    * @param {!Object<string, string>} prefs
    */
   _initializeExperiments(prefs) {
     Runtime.experiments.register('accessibilityInspection', 'Accessibility Inspection');
     Runtime.experiments.register('applyCustomStylesheet', 'Allow custom UI themes');
@@ skipping 879 matching lines @@
    * @override
    * @return {?Element}
    */
   settingElement() {
     return UI.SettingsUI.createSettingCheckbox(
         Common.UIString('Show rulers'), Common.moduleSetting('showMetricsRulers'));
   }
 };
 
 new Main.Main();