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During startup, the mini_installer attempts to free up disk space left
occupied by previous runs of the installer that may have failed to
perform their own cleanup. Such freeing shouldn't cross junction points
or links or other similar filesystem constructs, since such would not
have been created by a previous run. This CL simply skips over any
directories that have reparse points -- directories created by the
installer should not have any.

BUG=1100280
R=waffles@chromium.org

Change-Id: I20d874db50bd11faeac8e03522d162abcae095b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276207
Commit-Queue: Greg Thompson <grt@chromium.org>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Auto-Submit: Greg Thompson <grt@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784428}