GitLab

https://crrev.com/784428 stopped recursing across junction points when
looking for CR_* or chrome_* directories. This CL does the same when
deleting within those directories.

BUG=1100280
R=forshaw@chromium.org

Change-Id: I7a4ef84d9df744cf5d0bd64d51065a571228520d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2292395Reviewed-by: James Forshaw <forshaw@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#787752}