Use IsIndependentOffTheRecordProfile() in Browser destruction.

Just to improve readability, no behavioral change.

Bug: 968028
Change-Id: I0801440b45f0c4bf59c01956658f05ca5f6a5398
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1660664
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#669705}
1 file changed