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Slightly surprising, but apparently on Windows, one can write
base::DeleteFileW() and still end up calling base::DeleteFile(). Fix
these callers to use base::DeleteFile() directly, rather than relying on
some macro magic. Also stop using the deprecated version of
base::DeleteFile() and fix some nits.

Bug: 1009837
Change-Id: I3e8e35c7d57928b587dc103217fccb7d1f0b4fa3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2313042Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790889}