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Specifically, staged files are now ignored regardless of case and
containing directory.

BUG=673900

Change-Id: I72ded358fbde1c525eaec538ebdb184a79b58c6e
Reviewed-on: https://chromium-review.googlesource.com/598091Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Sébastien Marchand <sebmarchand@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491752}