DevTools: Remove unused frontend code

Source/devtools/front_end/sdk/LayerTreeModel.js

Index: Source/devtools/front_end/sdk/LayerTreeModel.js
diff --git a/Source/devtools/front_end/sdk/LayerTreeModel.js b/Source/devtools/front_end/sdk/LayerTreeModel.js
index f47b4cf3438bb518fdba2d7843291d7bcab49550..9a12ef80cc0b7ab3d8f60e8c1d81939b6667e83f 100644
--- a/Source/devtools/front_end/sdk/LayerTreeModel.js
+++ b/Source/devtools/front_end/sdk/LayerTreeModel.js
@@ -1131,31 +1131,6 @@ WebInspector.DeferredLayerTree.prototype = {
 
 /**
  * @constructor
- * @extends {WebInspector.DeferredLayerTree}
- * @param {?WebInspector.Target} target
- * @param {!Array.<!LayerTreeAgent.Layer>} layers
- */
-WebInspector.DeferredAgentLayerTree = function(target, layers)
-{
-    WebInspector.DeferredLayerTree.call(this, target);
-    this._layers = layers;
-}
-
-WebInspector.DeferredAgentLayerTree.prototype = {
-    /**
-     * @param {function(!WebInspector.LayerTreeBase)} callback
-     */
-    resolve: function(callback)
-    {
-        var result = new WebInspector.AgentLayerTree(this._target);
-        result.setLayers(this._layers, callback.bind(null, result));
-    },
-
-    __proto__: WebInspector.DeferredLayerTree.prototype
-};
-
-/**
- * @constructor
  * @implements {LayerTreeAgent.Dispatcher}
  * @param {!WebInspector.LayerTreeModel} layerTreeModel
  */