Revert of Make profiling lock global rather than per Target

Source/devtools/front_end/sdk/WorkerTargetManager.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 /**
  * @constructor
  * @param {!WebInspector.Target} mainTarget
  * @param {!WebInspector.TargetManager} targetManager
  */
 WebInspector.WorkerTargetManager = function(mainTarget, targetManager)
 {
     this._mainTarget = mainTarget;
     this._targetManager = targetManager;
     mainTarget.workerManager.addEventListener(WebInspector.WorkerManager.Events.WorkerAdded, this._onWorkerAdded, this);
-    WebInspector.profilingLock.addEventListener(WebInspector.Lock.Events.StateChanged, this._onProfilingStateChanged, this);
+    mainTarget.profilingLock.addEventListener(WebInspector.Lock.Events.StateChanged, this._onProfilingStateChanged, this);
     this._onProfilingStateChanged();
 }
 
 WebInspector.WorkerTargetManager.prototype = {
     _onProfilingStateChanged: function()
     {
-        var acquired = WebInspector.profilingLock.isAcquired();
+        var acquired = this._mainTarget.profilingLock.isAcquired();
         this._mainTarget.workerAgent().setAutoconnectToWorkers(!acquired);
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
     _onWorkerAdded: function(event)
     {
         var data = /** @type {{workerId: number, url: string, inspectorConnected: boolean}} */ (event.data);
         new WebInspector.WorkerConnection(this._mainTarget, data.workerId, data.inspectorConnected, onConnectionReady.bind(this));
@@ skipping 76 matching lines @@
     _close: function()
     {
         this._target.workerManager.removeEventListener(WebInspector.WorkerManager.Events.MessageFromWorker, this._dispatchMessageFromWorker, this);
         this._target.workerManager.removeEventListener(WebInspector.WorkerManager.Events.WorkerRemoved, this._onWorkerRemoved, this);
         this._target.workerManager.removeEventListener(WebInspector.WorkerManager.Events.WorkersCleared, this._close, this);
         this.connectionClosed("worker_terminated");
     },
 
     __proto__: InspectorBackendClass.Connection.prototype
 }