DevTools: Introduce module initializers

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 501 matching lines @@
 }
 
 // Contributed audit rules should go into this namespace.
 WebInspector.AuditRules = {};
 
 /**
  * Contributed audit categories should go into this namespace.
  * @type {!Object.<string, function(new:WebInspector.AuditCategory)>}
  */
 WebInspector.AuditCategories = {};
-
-importScript("AuditCategory.js");
-importScript("AuditCategories.js");
-importScript("AuditController.js");
-importScript("AuditFormatters.js");
-importScript("AuditLauncherView.js");
-importScript("AuditResultView.js");
-importScript("AuditRules.js");