Revert of Revert of DevTools: allow storing devtools preferences on the browser side. [blink]

Source/devtools/front_end/settings/SettingsScreen.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 170 matching lines @@
     this._nameToSettingElement = new Map();
     for (var sectionName of explicitSectionOrder)
         this._sectionElement(sectionName);
     self.runtime.extensions("setting").forEach(this._addSetting.bind(this));
     self.runtime.extensions(WebInspector.SettingUI).forEach(this._addSettingUI.bind(this));
 
     this._appendSection().appendChild(createTextButton(WebInspector.UIString("Restore defaults and reload"), restoreAndReload));
 
     function restoreAndReload()
     {
-        if (window.localStorage)
-            window.localStorage.clear();
+        WebInspector.settings.clearAll();
         WebInspector.reload();
     }
 }
 
 WebInspector.GenericSettingsTab.prototype = {
     /**
      * @param {!Runtime.Extension} extension
      */
     _addSetting: function(extension)
     {
@@ skipping 861 matching lines @@
             var columnId = columns[i];
             var editElement = this._addInputElements.get(columnId);
             this._setEditElementValue(editElement, "");
         }
     },
 
     __proto__: WebInspector.SettingsList.prototype
 }
 
 WebInspector._settingsController = new WebInspector.SettingsController();