[DebugVisualizers] Remove NGPhysicalLineBoxFragment::Children

This member was removed in r873361 crrev.com/c/2830411. This
patch removes it accordingly.

Change-Id: Ic9f42a93d581c7533aa1cd427384c16f9a0e51dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3122704
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/main@{#916228}
NOKEYCHECK=True
GitOrigin-RevId: 741dfd6e18494813e1ae7c83001d1b093c21623f
1 file changed