DevTools: use timing information for "disk cached" resources.

Source/devtools/front_end/network/RequestHeadersView.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) IBM Corp. 2009  All rights reserved.
  * Copyright (C) 2010 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 384 matching lines @@
             else
                 statusCodeImage.classList.add("red-ball");
 
             requestMethodElement.title = this._formatHeader(WebInspector.UIString("Request Method"), this._request.requestMethod);
 
             var statusTextElement = statusCodeFragment.createChild("div", "header-value source-code");
             var statusText = this._request.statusCode + " " + this._request.statusText;
             if (this._request.fetchedViaServiceWorker) {
                 statusText += " " + WebInspector.UIString("(from ServiceWorker)");
                 statusTextElement.classList.add("status-from-cache");
-            } else if (this._request.cached) {
+            } else if (this._request.cached()) {
                 statusText += " " + WebInspector.UIString("(from cache)");
                 statusTextElement.classList.add("status-from-cache");
             }
             statusTextElement.textContent = statusText;
 
             statusCodeElement.title = statusCodeFragment;
         }
     },
 
     /**
@@ skipping 97 matching lines @@
      * @return {!Element}
      */
     _createHeadersToggleButton: function(isHeadersTextShown)
     {
         var toggleTitle = isHeadersTextShown ? WebInspector.UIString("view parsed") : WebInspector.UIString("view source");
         return this._createToggleButton(toggleTitle);
     },
 
     __proto__: WebInspector.VBox.prototype
 }