[DevTools] Remove SDKModels' fromTarget methods

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 26 matching lines @@
     target.registerLayerTreeDispatcher(new Layers.LayerTreeDispatcher(this));
     var resourceTreeModel = target.model(SDK.ResourceTreeModel);
     if (resourceTreeModel) {
       resourceTreeModel.addEventListener(
           SDK.ResourceTreeModel.Events.MainFrameNavigated, this._onMainFrameNavigated, this);
     }
     /** @type {?SDK.LayerTreeBase} */
     this._layerTree = null;
   }
 
-  /**
-   * @param {!SDK.Target} target
-   * @return {?Layers.LayerTreeModel}
-   */
-  static fromTarget(target) {
-    return target.model(Layers.LayerTreeModel);
-  }
-
   disable() {
     if (!this._enabled)
       return;
     this._enabled = false;
     this.target().layerTreeAgent().disable();
   }
 
   enable() {
     if (this._enabled)
       return;
@@ skipping 495 matching lines @@
 
   /**
    * @override
    * @param {!Protocol.LayerTree.LayerId} layerId
    * @param {!Protocol.DOM.Rect} clipRect
    */
   layerPainted(layerId, clipRect) {
     this._layerTreeModel._layerPainted(layerId, clipRect);
   }
 };