[DevTools] Merge Worker domain to Target, migrate clients.

third_party/WebKit/Source/devtools/front_end/timeline_model/TimelineModel.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 463 matching lines @@
 
     /**
      * @param {!WebInspector.TracingModel.Event} event
      * @return {?WebInspector.Target}
      */
     targetByEvent: function(event)
     {
         // FIXME: Consider returning null for loaded traces.
         var workerId = this._workerIdByThread.get(event.thread);
         var mainTarget = WebInspector.targetManager.mainTarget();
-        return workerId ? mainTarget.workerManager.targetByWorkerId(workerId) : mainTarget;
+        return workerId ? mainTarget.subTargetsManager.targetForId(workerId) : mainTarget;
     },
 
     /**
      * @param {!WebInspector.TracingModel} tracingModel
      * @param {boolean=} produceTraceStartedInPage
      */
     setEvents: function(tracingModel, produceTraceStartedInPage)
     {
         this.reset();
         this._resetProcessingState();
@@ skipping 1358 matching lines @@
         if (!id)
             return;
         /** @type {!Map<string, !WebInspector.TracingModel.Event>|undefined} */
         var initiatorMap = this._initiatorByType.get(initiatorType);
         if (isInitiator)
             initiatorMap.set(id, event);
         else
             event.initiator = initiatorMap.get(id) || null;
     }
 };