Fixed element to use base table

Author: Lonzak

user/src/com/google/gwt/user/client/ui/TreeItem.java

@@ -89,7 +89,7 @@ void initializeClonableElements() {
         // Create the base table element that will be cloned.
         BASE_INTERNAL_ELEM = DOM.createTable();
         // aria role to indicate it is a plain layout table
-        Roles.getPresentationRole().set(BASE_BARE_ELEM);
+        Roles.getPresentationRole().set(BASE_INTERNAL_ELEM);
         Element contentElem = DOM.createDiv();
         Element tbody = DOM.createTBody(), tr = DOM.createTR();
         Element tdImg = DOM.createTD(), tdContent = DOM.createTD();