DevTools: Remove unused isAncestor parameter from findTreeElement in TreeOutline.

Source/devtools/front_end/ui/treeoutline.js

 /*
  * Copyright (C) 2007 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 265 matching lines @@
         return null;
 
     var elements = this._treeElementsMap.get(representedObject);
     if (elements && elements.length)
         return elements[0];
     return null;
 }
 
 /**
  * @param {?Object} representedObject
- * @param {function(!Object, !Object):boolean} isAncestor
  * @param {function(!Object):?Object} getParent
  * @return {?TreeElement}
  */
-TreeOutline.prototype.findTreeElement = function(representedObject, isAncestor, getParent)
+TreeOutline.prototype.findTreeElement = function(representedObject, getParent)
 {
     if (!representedObject)
         return null;
 
     var cachedElement = this.getCachedTreeElement(representedObject);
     if (cachedElement)
         return cachedElement;
 
     // Walk up the parent pointers from the desired representedObject
     var ancestors = [];
@@ skipping 667 matching lines @@
 }
 
 TreeElement.prototype.isEventWithinDisclosureTriangle = function(event)
 {
     // FIXME: We should not use getComputedStyle(). For that we need to get rid of using ::before for disclosure triangle. (http://webk.it/74446)
     var paddingLeftValue = window.getComputedStyle(this._listItemNode).getPropertyCSSValue("padding-left");
     var computedLeftPadding = paddingLeftValue ? paddingLeftValue.getFloatValue(CSSPrimitiveValue.CSS_PX) : 0;
     var left = this._listItemNode.totalOffsetLeft() + computedLeftPadding;
     return event.pageX >= left && event.pageX <= left + this.arrowToggleWidth && this.hasChildren;
 }