Clear button doesn't clear everything in memory section.

Source/devtools/front_end/MemoryStatistics.js

 /*
  * Copyright (C) 2012 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 249 matching lines @@
      */
     _onRecordAdded: function(event)
     {
         throw new Error("Not implemented");
     },
 
     _onRecordsCleared: function()
     {
         for (var i = 0; i < this._counters.length; ++i)
             this._counters[i].reset();
+
+        for (var i = 0; i < this._counterUI.length; ++i)
+            this._counterUI[i].reset();
+
         this.refresh();
     },
 
     _resize: function()
     {
         var parentElement = this._canvas.parentElement;
         this._canvas.width = parentElement.clientWidth;
         this._canvas.height = parentElement.clientHeight;
         this.refresh();
     },
@@ skipping 103 matching lines @@
     },
 
     _clear: function()
     {
         var ctx = this._canvas.getContext("2d");
         ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
     },
 
     __proto__: WebInspector.SplitView.prototype
 }