Clear button doesn't clear everything in memory section.

Source/devtools/front_end/CountersGraph.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 47 matching lines @@
     this._currentValueLabel = currentValueLabel;
     this._marker = memoryCountersPane._canvasContainer.createChild("div", "memory-counter-marker");
     this._marker.style.backgroundColor = color;
     this.clearCurrentValueAndMarker();
 
     this.graphColor = color;
     this.graphYValues = [];
 }
 
 WebInspector.CounterUI.prototype = {
+    reset: function()
+    {
+        this._range.textContent = "";
+    },
+
     /**
      * @param {number} minValue
      * @param {number} maxValue
      */
     setRange: function(minValue, maxValue)
     {
         this._range.textContent = WebInspector.UIString("[%d:%d]", minValue, maxValue);
     },
 
     __proto__: WebInspector.CounterUIBase.prototype
@@ skipping 119 matching lines @@
         ctx.lineWidth = 1;
         ctx.strokeStyle = counterUI.graphColor;
         ctx.stroke();
         ctx.closePath();
         ctx.restore();
     },
 
     __proto__: WebInspector.MemoryStatistics.prototype
 }