DevTools: Use "toolbox.html" in URL passed to window.open() as a toolbox

Source/devtools/front_end/toolbox_bootstrap/Toolbox.js

 // Copyright 2014 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.
 
 function windowLoaded()
 {
     window.removeEventListener("DOMContentLoaded", windowLoaded, false);
     new WebInspector.Toolbox();
 }
 window.addEventListener("DOMContentLoaded", windowLoaded, false);
 
 /**
  * @constructor
  */
 WebInspector.Toolbox = function()
 {
-    if (!window.opener || !Runtime.queryParam("toolbox"))
+    if (!window.opener)
         return;
 
     WebInspector.zoomManager = new WebInspector.ZoomManager(window.opener.InspectorFrontendHost);
     WebInspector.overridesSupport = window.opener.WebInspector.overridesSupport;
     WebInspector.settings = window.opener.WebInspector.settings;
     WebInspector.experimentsSettings = window.opener.WebInspector.experimentsSettings;
     WebInspector.targetManager = window.opener.WebInspector.targetManager;
     WebInspector.workspace = window.opener.WebInspector.workspace;
     WebInspector.cssWorkspaceBinding = window.opener.WebInspector.cssWorkspaceBinding;
     WebInspector.Revealer = window.opener.WebInspector.Revealer;
     WebInspector.ContextMenu = window.opener.WebInspector.ContextMenu;
     WebInspector.installPortStyles();
 
     var delegate = /** @type {!WebInspector.ToolboxDelegate} */ (window.opener.WebInspector["app"]);
     var rootView = new WebInspector.RootView();
     var inspectedPagePlaceholder = new WebInspector.InspectedPagePlaceholder();
     this._responsiveDesignView = new WebInspector.ResponsiveDesignView(inspectedPagePlaceholder);
     this._responsiveDesignView.show(rootView.element);
     rootView.attachToBody();
     delegate.toolboxLoaded(this._responsiveDesignView, inspectedPagePlaceholder);
 }
 
 // FIXME: This stub is invoked from the backend and should be removed
 // once we migrate to the "pull" model for extensions retrieval.
 WebInspector.addExtensions = function() {}