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mini_installer recursively deletes directories left behind from previous
runs. As it recurses through them, it may delete files with reparse
points in those dirs. This is bad, since such files may actually be
maliciously-created links to other entities on the filesystem. This CL
skips anything with a reparse point during deletion -- since Chrome
never creates files/dirs with reparse points, it shouldn't try to delete
them.

BUG=1125018
R=wfh@chromium.org

Change-Id: I9897947ed883a91758c31990ed0b9648c38d2942
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2409698
Auto-Submit: Greg Thompson <grt@chromium.org>
Commit-Queue: Will Harris <wfh@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806715}