The old code just looked to see if there were more than three root
nodes in the ODSession, which as of macOS 14 is always true. Change
the code to more precisely look for either LDAP or Active Directory
binding.

(cherry picked from commit a6119e60e63c452b853a5db1cb59650a6bcf7737)

Bug: 1499928
Change-Id: I08227a9a71537a74dcb8cb417594ff2d9abe559a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5007463
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1220617}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5017743
Auto-Submit: Avi Drissman <avi@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/branch-heads/6045@{#1280}
Cr-Branched-From: 905e8bdd32d891451d94d1ec71682e989da2b0a1-refs/heads/main@{#1204232}