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Fix a typo in PRESUBMIT.py and sort th |HISTOGRAMS_XMLS_RELATIVE|
because different OSes have different file system which introduces
non-deterministic into the output of _FindHistogramsXmlFiles() .

Bug: 1116807
Change-Id: I8ff36de29464d388f012864155028a77fdb44e6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2372775Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Auto-Submit: Weilun Shi <sweilun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801465}