GitLab

In Files app we added a title inside the list, when clicking in the
title it throws an exception in the assertInstanceof() in
getListItemAncestor().

This CL fixes getListItemAncestor() to not raise in this condition,
instead it returns null as the description says. It also fixes event
handlers that calls this function to check if it has returned null.

Test: browser_tests --gtest_filter="WebUIResourceBrowserTest.ListTest"
Bug: 1063184
Change-Id: Icf92cc30bb0a346c7e19660f847a994286abfea6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2111252
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752381}