DevTools: fix selected tab rendering on non-default zoom levels.

Source/devtools/front_end/ui/TabbedPane.js

 /*
  * 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:
  *
  *     * 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 744 matching lines @@
     _updateTabSlider: function()
     {
         if (!this._currentTab)
             return;
         if (!this._sliderEnabled)
             return;
         var left = 0;
         for (var i = 0; this._currentTab !== this._tabs[i] && this._tabs[i]._shown && i < this._tabs.length; i++)
             left += this._tabs[i]._measuredWidth;
         var sliderWidth = this._currentTab._shown ? this._currentTab._measuredWidth : this._dropDownButton.offsetWidth;
-        this._tabSlider.style.transform = "translateX(" + left + "px) scaleX(" + sliderWidth + ")";
+        this._tabSlider.style.transform = "translateX(" + left + "px)";
+        this._tabSlider.style.width = sliderWidth + "px";
     },
 
     /**
      * @param {!WebInspector.TabbedPaneTab} tab
      */
     _hideTab: function(tab)
     {
         tab.tabElement.classList.remove("selected");
         tab.view.detach();
     },
@@ skipping 549 matching lines @@
     /**
      * @param {string} id1
      * @param {string} id2
      * @return {number}
      */
     _tabOrderComparator: function(id1, id2)
     {
         return this._tabOrders[id2] = this._tabOrders[id1];
     }
 }