chore: cherry-pick f46db6aac3e9 from chromium

[ppontes]

Do not traverse directory symlinks when uploading folder

Previous patch crrev.com/c/3866767 removed symlink files when uploading
a folder. However, while the remaining files are themselves not
symlinks, they may be included as the result of traversing directory
symlink.

This patch further excludes such files by checking if any parent
directory is a symlink, all the way until the base directory (which is
the directory chosen for upload).

(cherry picked from commit 4fa830d8af6b2fb293219edeb39eebccfd322305)

Fixed: 1378997
Change-Id: I75a92df4cd50f9aba7824955a3de792583bc6154
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3997720
Reviewed-by: Austin Sullivan asully@chromium.org
Reviewed-by: Mason Freed masonf@chromium.org
Reviewed-by: Alex Moshchuk alexmos@chromium.org
Commit-Queue: Xiaocheng Hu xiaochengh@chromium.org
Cr-Original-Commit-Position: refs/heads/main@{#1067310}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4025427
Bot-Commit: Rubber Stamper rubber-stamper@appspot.gserviceaccount.com
Commit-Queue: Srinivas Sista srinivassista@chromium.org
Owners-Override: Srinivas Sista srinivassista@chromium.org
Cr-Commit-Position: refs/branch-heads/5359@{#823}
Cr-Branched-From: 27d3765d341b09369006d030f83f582a29eb57ae-refs/heads/main@{#1058933}

Notes: Security: backported fix for CVE-2022-4190.

[release-clerk]

Release Notes Persisted

Security: backported fix for CVE-2022-4190.