DevTools: Refactor network panel overview

Source/devtools/front_end/timeline/TimelineMemoryOverview.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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 /**
  * @constructor
  * @extends {WebInspector.TimelineOverviewBase}
  * @param {!WebInspector.TimelineModel} model
  */
 WebInspector.TimelineMemoryOverview = function(model)
 {
-    WebInspector.TimelineOverviewBase.call(this, model);
+    WebInspector.TimelineOverviewBase.call(this);
     this.element.id = "timeline-overview-memory";
+    this._model = model;
 
     this._heapSizeLabel = this.element.createChild("div", "memory-graph-label");
 }
 
 WebInspector.TimelineMemoryOverview.prototype = {
     resetHeapSizeLabels: function()
     {
         this._heapSizeLabel.textContent = "";
     },
 
@@ skipping 93 matching lines @@
         ctx.fill();
         ctx.lineWidth = lineWidth;
         ctx.strokeStyle = "hsl(220, 90%, 70%)";
         ctx.stroke();
 
         this._heapSizeLabel.textContent = WebInspector.UIString("%s \u2013 %s", Number.bytesToString(minUsedHeapSize), Number.bytesToString(maxUsedHeapSize));
     },
 
     __proto__: WebInspector.TimelineOverviewBase.prototype
 }