Revert 108482 - [filebrowser] Fix the bug with leadIndex being null in ListSingleSelectionModel.

BUG=chromium-os:21669
TEST=See bug.

Review URL: http://codereview.chromium.org/8372100

TBR=kaznacheev@chromium.org
Review URL: http://codereview.chromium.org/8557007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@109849 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/shared/js/cr/ui/list_single_selection_model.js

@@ -52,8 +52,7 @@ cr.define('cr.ui', function() {
 
       if (i != oldSelectedIndex) {
         this.beginChange();
-        this.selectedIndex_ = i;
-        this.leadIndex_ = this.anchorIndex_ = i;
+        this.selectedIndex_ = i
         this.endChange();
       }
     },