[Devtools] Template fromTarget() function calls to model

third_party/WebKit/Source/devtools/front_end/layers/LayerTreeModel.js

 /*
  * Copyright (C) 2013 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 30 matching lines @@
   }
 
   /**
    * @param {!SDK.Target} target
    * @return {?Layers.LayerTreeModel}
    */
   static fromTarget(target) {
     if (!target.hasDOMCapability())
       return null;
 
-    var model = /** @type {?Layers.LayerTreeModel} */ (target.model(Layers.LayerTreeModel));
+    var model = target.model(Layers.LayerTreeModel);
     if (!model)
       model = new Layers.LayerTreeModel(target);
     return model;
   }
 
   disable() {
     if (!this._enabled)
       return;
     this._enabled = false;
     this.target().layerTreeAgent().disable();
@@ skipping 498 matching lines @@
 
   /**
    * @override
    * @param {!Protocol.LayerTree.LayerId} layerId
    * @param {!Protocol.DOM.Rect} clipRect
    */
   layerPainted(layerId, clipRect) {
     this._layerTreeModel._layerPainted(layerId, clipRect);
   }
 };