DevTools: get rid of WebInspector.cssModel, use target models instead

Source/devtools/front_end/audits/AuditsPanel.js

 /*
  * Copyright (C) 2012 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 33 matching lines @@
 
     this.auditsItemTreeElement = new WebInspector.AuditsSidebarTreeElement(this);
     this.auditsTreeElement.appendChild(this.auditsItemTreeElement);
 
     this.auditResultsTreeElement = new WebInspector.SidebarSectionTreeElement(WebInspector.UIString("RESULTS"), {}, true);
     this.sidebarTree.appendChild(this.auditResultsTreeElement);
     this.auditResultsTreeElement.expand();
 
     this._constructCategories();
 
-    var target = /** @type {!WebInspector.Target} */ (WebInspector.targetManager.activeTarget());
+    var target = /** @type {!WebInspector.Target} */ (WebInspector.targetManager.mainTarget());
     this._auditController = new WebInspector.AuditController(target, this);
     this._launcherView = new WebInspector.AuditLauncherView(this._auditController);
     for (var id in this.categoriesById)
         this._launcherView.addCategory(this.categoriesById[id]);
 }
 
 WebInspector.AuditsPanel.prototype = {
     /**
      * @return {boolean}
      */
@@ skipping 458 matching lines @@
  */
 WebInspector.AuditCategories = {};
 
 importScript("AuditCategory.js");
 importScript("AuditCategories.js");
 importScript("AuditController.js");
 importScript("AuditFormatters.js");
 importScript("AuditLauncherView.js");
 importScript("AuditResultView.js");
 importScript("AuditRules.js");