DevTools: Fix flamechart height

Source/devtools/front_end/ui_lazy/FlameChart.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 1452 matching lines @@
         this._pixelWindowWidth = this._offsetWidth - this._paddingLeft;
         this._totalPixels = Math.floor(this._pixelWindowWidth / this._windowWidth);
         this._pixelWindowLeft = Math.floor(this._totalPixels * this._windowLeft);
 
         this._timeToPixel = this._totalPixels / this._totalTime;
         this._pixelToTime = this._totalTime / this._totalPixels;
         this._paddingLeftTime = this._paddingLeft / this._timeToPixel;
 
         this._baseHeight = this._isTopDown ? WebInspector.FlameChart.DividersBarHeight : this._offsetHeight - this._barHeight;
 
-        this._totalHeight = this._levelToHeight(this._dataProvider.maxStackDepth() + 1);
+        this._totalHeight = this._levelToHeight(this._dataProvider.maxStackDepth());
         this._vScrollContent.style.height = this._totalHeight + "px";
         this._updateScrollBar();
     },
 
     onResize: function()
     {
         this._updateScrollBar();
         this._updateContentElementSize();
         this.scheduleUpdate();
     },
@@ skipping 47 matching lines @@
         this.update();
     },
 
     _enabled: function()
     {
         return this._rawTimelineDataLength !== 0;
     },
 
     __proto__: WebInspector.HBox.prototype
 }