DevTools: introduce the Clear storage pane in the resources panel.

third_party/WebKit/Source/devtools/front_end/resources/ServiceWorkersView.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}
  * @implements {WebInspector.TargetManager.Observer}
  */
 WebInspector.ServiceWorkersView = function()
@@ skipping 11 matching lines @@
     WebInspector.targetManager.observeTargets(this);
 }
 
 WebInspector.ServiceWorkersView.prototype = {
     /**
      * @override
      * @param {!WebInspector.Target} target
      */
     targetAdded: function(target)
     {
-        if (this._target)
+        if (this._target || !target.serviceWorkerManager)
             return;
         this._target = target;
         this._manager = this._target.serviceWorkerManager;
 
         var forceUpdate = new WebInspector.ToolbarCheckbox(WebInspector.UIString("Force update on reload"), WebInspector.UIString("Force update Service Worker on page reload"), this._manager.forceUpdateOnReloadSetting());
         this._toolbar.appendToolbarItem(forceUpdate);
         var fallbackToNetwork = new WebInspector.ToolbarCheckbox(WebInspector.UIString("Bypass worker for network"), WebInspector.UIString("Bypass Service Worker and load resources from the network"), target.networkManager.bypassServiceWorkerSetting());
         this._toolbar.appendToolbarItem(fallbackToNetwork);
         this._toolbar.appendSpacer();
         this._showAllCheckbox = new WebInspector.ToolbarCheckbox(WebInspector.UIString("Show all"), WebInspector.UIString("Show all Service Workers regardless of the origin"));
@@ skipping 344 matching lines @@
         return contentElement;
     },
 
     _dispose: function()
     {
         this._linkifier.dispose();
         if (this._pendingUpdate)
             clearTimeout(this._pendingUpdate);
     }
 }