DevTools: Remove redundant dependency on target from TimelineFrameModel

Source/devtools/front_end/timeline/TimelineLayersView.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
  * @extends {WebInspector.VBox}
  */
@@ skipping 29 matching lines @@
         if (this._updateWhenVisible) {
             this._updateWhenVisible = false;
             this._update();
         }
     },
 
     _update: function()
     {
         var layerTree;
 
-        this._weakTarget = this._deferredLayerTree.weakTarget();
+        this._target = this._deferredLayerTree.target();
         var originalTiles = this._paintTiles;
         var tilesReadyBarrier = new CallbackBarrier();
         this._deferredLayerTree.resolve(tilesReadyBarrier.createCallback(onLayersReady));
-        var target = this._weakTarget.get();
-        if (target) {
+        if (this._target) {
             for (var i = 0; this._paints && i < this._paints.length; ++i)
-                WebInspector.PaintProfilerSnapshot.load(target, this._paints[i].picture, tilesReadyBarrier.createCallback(onSnapshotLoaded.bind(this, this._paints[i])));
+                WebInspector.PaintProfilerSnapshot.load(this._target, this._paints[i].picture, tilesReadyBarrier.createCallback(onSnapshotLoaded.bind(this, this._paints[i])));
         }
         tilesReadyBarrier.callWhenDone(onLayersAndTilesReady.bind(this));
 
         /**
          * @param {!WebInspector.LayerTreeBase} resolvedLayerTree
          */
         function onLayersReady(resolvedLayerTree)
         {
             layerTree = resolvedLayerTree;
         }
@@ skipping 53 matching lines @@
 
     /**
      * @param {?WebInspector.DOMNode} node
      */
     _toggleNodeHighlight: function(node)
     {
         if (node) {
             node.highlightForTwoSeconds();
             return;
         }
-        var target = this._weakTarget.get();
-        if (target)
-            target.domModel.hideDOMNodeHighlight();
+        if (this._target)
+            this._target.domModel.hideDOMNodeHighlight();
 
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
     _onObjectSelected: function(event)
     {
         var activeObject = /** @type {!WebInspector.Layers3DView.ActiveObject} */ (event.data);
         this._selectObject(activeObject);
@@ skipping 10 matching lines @@
 
     _disposeTiles: function()
     {
         for (var i = 0; i < this._paintTiles.length; ++i)
             this._paintTiles[i].snapshot.dispose();
         this._paintTiles = [];
     },
 
     __proto__: WebInspector.VBox.prototype
 }