Refactorings to reduce dependencies in ChromeVox 2.

chrome/browser/resources/chromeos/chromevox/walkers/layout_line_walker.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview A JavaScript class for walking lines consisting of one or more
  * clickable nodes.
  */
 
 
@@ skipping 196 matching lines @@
  * ordering.
  * @param {!cvox.CursorSelection} sel A selection that represents the location
  * of the braille cursor.
  * @param {!cvox.CursorSelection} cur The specific selection to append.
  * @param {!cvox.NavBraille} braille Braille on which to append.
  * @private
  */
 cvox.LayoutLineWalker.prototype.appendBraille_ = function(
     prevSel, sel, cur, braille) {
   var item = this.subWalker_.getBraille(prevSel, cur).text;
-  var valueSelectionSpan = item.getSpanInstanceOf(
-      cvox.BrailleUtil.ValueSelectionSpan);
+  var valueSelectionSpan = item.getSpanInstanceOf(cvox.ValueSelectionSpan);
 
   if (braille.text.getLength() > 0) {
     braille.text.append(cvox.BrailleUtil.ITEM_SEPARATOR);
   }
 
   // Find the surrounding logical "leaf node".
   // This prevents us from labelling the braille output with the wrong node,
   // such as a text node child of a <textarea>.
   var node = cur.start.node;
   while (node.parentNode && cvox.DomUtil.isLeafNode(node.parentNode)) {
     node = node.parentNode;
   }
 
   var nodeStart = braille.text.getLength();
   var nodeEnd = nodeStart + item.getLength();
   braille.text.append(item);
   braille.text.setSpan(node, nodeStart, nodeEnd);
 
   if (sel && cur.absEquals(sel)) {
     if (valueSelectionSpan) {
       braille.startIndex = nodeStart + item.getSpanStart(valueSelectionSpan);
       braille.endIndex = nodeStart + item.getSpanEnd(valueSelectionSpan);
     } else {
       braille.startIndex = nodeStart;
       braille.endIndex = nodeStart + 1;
     }
   }
 };