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Upcoming changes to filename_util are unreviewable if they include
material code changes and formatting changes. This CL just includes
formatting changes and is the result of running:

  'clang-format -i --style=Chromium filename_util_unittest.cc'.

Depends on: https://codereview.chromium.org/869823003
Needed by : https://codereview.chromium.org/869233006

BUG=444102

Review URL: https://codereview.chromium.org/873843002

Cr-Commit-Position: refs/heads/master@{#314399}