DevTools: refactoring connection creation, removing a couple of dead code branches.

Source/devtools/front_end/sdk/WorkerManager.js

Index: Source/devtools/front_end/sdk/WorkerManager.js
diff --git a/Source/devtools/front_end/sdk/WorkerManager.js b/Source/devtools/front_end/sdk/WorkerManager.js
index 55326333968484696fb77a0df884de3af65236b5..7c1c23b65e3a29cd06c9bffe522c2b4b38700340 100644
--- a/Source/devtools/front_end/sdk/WorkerManager.js
+++ b/Source/devtools/front_end/sdk/WorkerManager.js
@@ -173,14 +173,12 @@ WebInspector.workerManager;
  * @constructor
  * @extends {InspectorBackendClass.Connection}
  * @param {string} workerId
- * @param {function(!InspectorBackendClass.Connection)} onConnectionReady
  */
-WebInspector.ExternalWorkerConnection = function(workerId, onConnectionReady)
+WebInspector.ExternalWorkerConnection = function(workerId)
 {
     InspectorBackendClass.Connection.call(this);
     this._workerId = workerId;
     window.addEventListener("message", this._processMessage.bind(this), true);
-    onConnectionReady(this);
 }
 
 WebInspector.ExternalWorkerConnection.prototype = {