Blocks resources from adding headers that match settings

Certain Xml resources have a single setting for the page
which often means the header and setting have the same
title. This CL stops the header from being indexed in
that case.

Bug: 33701673
Test: make RunSettingsRoboTests
Change-Id: Ie617414010e654c41fd014aa2fe297e6d2088ca5
2 files changed