Devtools: initialize protocol enums synchronously

Source/devtools/front_end/main/TestController.js

 /*
  * Copyright (C) 2009 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 24 matching lines @@
 
     function invokeMethod()
     {
         try {
             script = script + "//# sourceURL=evaluateInWebInspector" + callId + ".js";
             window.eval(script);
         } catch (e) {
             console.error(e.stack);
         }
     }
-    InspectorBackend.connection().runAfterPendingDispatches(invokeMethod);
+
+    WebInspector.targetManager.mainTarget()._connection.runAfterPendingDispatches(invokeMethod);
 }