Make profiling lock global rather than per Target

Source/devtools/front_end/sdk/DOMModel.js

 /*
  * Copyright (C) 2009, 2010 Google Inc. All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * 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.
@@ skipping 931 matching lines @@
     /** @type {?WebInspector.DOMDocument} */
     this._document = null;
     /** @type {!Object.<number, boolean>} */
     this._attributeLoadNodeIds = {};
     target.registerDOMDispatcher(new WebInspector.DOMDispatcher(this));
 
     this._defaultHighlighter = new WebInspector.DefaultDOMNodeHighlighter(this._agent);
     this._highlighter = this._defaultHighlighter;
 
     if (WebInspector.experimentsSettings.disableAgentsWhenProfile.isEnabled())
-        target.profilingLock.addEventListener(WebInspector.Lock.Events.StateChanged, this._profilingStateChanged, this);
+        WebInspector.profilingLock.addEventListener(WebInspector.Lock.Events.StateChanged, this._profilingStateChanged, this);
 
     this._agent.enable();
 }
 
 WebInspector.DOMModel.Events = {
     AttrModified: "AttrModified",
     AttrRemoved: "AttrRemoved",
     CharacterDataModified: "CharacterDataModified",
     NodeInserted: "NodeInserted",
     NodeInspected: "NodeInspected",
     NodeRemoved: "NodeRemoved",
     DocumentUpdated: "DocumentUpdated",
     ChildNodeCountUpdated: "ChildNodeCountUpdated",
     UndoRedoRequested: "UndoRedoRequested",
     UndoRedoCompleted: "UndoRedoCompleted",
 }
 
 WebInspector.DOMModel.prototype = {
     _profilingStateChanged: function()
     {
-        if (this.target().profilingLock.isAcquired())
+        if (WebInspector.profilingLock.isAcquired())
             this._agent.disable();
         else
             this._agent.enable();
     },
 
     /**
      * @param {function(!WebInspector.DOMDocument)=} callback
      */
     requestDocument: function(callback)
     {
@@ skipping 975 matching lines @@
      * @param {boolean} inspectUAShadowDOM
      * @param {!DOMAgent.HighlightConfig} config
      * @param {function(?Protocol.Error)=} callback
      */
     setInspectModeEnabled: function(enabled, inspectUAShadowDOM, config, callback)
     {
         WebInspector.overridesSupport.setTouchEmulationSuspended(enabled);
         this._agent.setInspectModeEnabled(enabled, inspectUAShadowDOM, config, callback);
     }
 }