[DevTools] Explicitly require ResourceTreeModel

third_party/WebKit/Source/devtools/front_end/elements/ComputedStyleModel.js

 // Copyright (c) 2015 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.
 
 /**
  * @extends {WebInspector.Object}
  * @constructor
  */
 WebInspector.ComputedStyleModel = function()
 {
@@ skipping 44 matching lines @@
             WebInspector.EventTarget.removeEventListeners(this._targetEvents);
             this._targetEvents = null;
         }
         this._target = target;
 
         var domModel = null;
         var resourceTreeModel = null;
         if (target) {
             this._cssModel = WebInspector.CSSModel.fromTarget(target);
             domModel = WebInspector.DOMModel.fromTarget(target);
-            resourceTreeModel = target.resourceTreeModel;
+            resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(target);
         }
 
         if (this._cssModel && domModel && resourceTreeModel) {
             this._targetEvents = [
                 this._cssModel.addEventListener(WebInspector.CSSModel.Events.StyleSheetAdded, this._onComputedStyleChanged, this),
                 this._cssModel.addEventListener(WebInspector.CSSModel.Events.StyleSheetRemoved, this._onComputedStyleChanged, this),
                 this._cssModel.addEventListener(WebInspector.CSSModel.Events.StyleSheetChanged, this._onComputedStyleChanged, this),
                 this._cssModel.addEventListener(WebInspector.CSSModel.Events.FontsUpdated, this._onComputedStyleChanged, this),
                 this._cssModel.addEventListener(WebInspector.CSSModel.Events.MediaQueryResultChanged, this._onComputedStyleChanged, this),
                 this._cssModel.addEventListener(WebInspector.CSSModel.Events.PseudoStateForced, this._onComputedStyleChanged, this),
@@ skipping 86 matching lines @@
 /**
  * @constructor
  * @param {!WebInspector.DOMNode} node
  * @param {!Map.<string, string>} computedStyle
  */
 WebInspector.ComputedStyleModel.ComputedStyle = function(node, computedStyle)
 {
     this.node = node;
     this.computedStyle = computedStyle;
 }