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There's 2 issues with histogram_paths.py on Windows:
  - Some path have different casing on Win vs Linux, see
    crbug.com/1132974 . This is not the right way to fix this but this
    allows running histogram_paths.py on Windows.
  - Normalizing the path separators after sorting them causes some
    sorting differences (this causes
    "tools/metrics/histograms/histograms_xml/renderer4/histograms.xml"
    to appear before
    "tools/metrics/histograms/histograms_xml/renderer/histograms.xml" on
    Windows.


Bug: 1132974
Change-Id: Id6953f29f2073551df9a13cc2c72d2e6eef33cd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436293Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811401}