[DevTools] Dock to left mode.

Source/devtools/front_end/ElementsPanel.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 1169 matching lines @@
     },
 
     _sidebarContextMenuEventFired: function(event)
     {
         var contextMenu = new WebInspector.ContextMenu(event);
         contextMenu.show();
     },
 
     _dockSideChanged: function()
     {
-        var dockSide = WebInspector.dockController.dockSide();
-        var vertically = dockSide === WebInspector.DockController.State.DockedToRight && WebInspector.settings.splitVerticallyWhenDockedToRight.get();
+        var vertically = WebInspector.dockController.isVertical() && WebInspector.settings.splitVerticallyWhenDockedToRight.get();
         this._splitVertically(vertically);
     },
 
     _showShadowDOMChanged: function()
     {
         this.treeOutline.update();
     },
 
     /**
      * @param {boolean} vertically
@@ skipping 170 matching lines @@
 WebInspector.ElementsPanel.DOMNodeRevealer.prototype = {
     /**
      * @param {!Object} node
      */
     reveal: function(node)
     {
         if (node instanceof WebInspector.DOMNode)
             /** @type {!WebInspector.ElementsPanel} */ (WebInspector.showPanel("elements")).revealAndSelectNode(node.id);
     }
 }