I will check the issue. Thanks.

Submitted https://chromium-review.googlesource.com/c/chromium/src/+/691535 for your consideration. Thanks.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/de445af03efead537cd6715f5e32586bf1968868

commit de445af03efead537cd6715f5e32586bf1968868
Author: nikhil <nikhil.sahni@samsung.com>
Date: Tue Oct 03 14:38:42 2017

Clean up in layer.cc

Using range-based loop to enumerate
|children_| and changing null to
nullptr.

BUG= 762615 


Change-Id: Ie0246f5bbb3a3d4d8cb857ca4719e4e94a7a4252
Reviewed-on: https://chromium-review.googlesource.com/691535
Reviewed-by: David Reveman <reveman@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Valery Arkhangorodsky <varkha@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506034}
[modify] https://crrev.com/de445af03efead537cd6715f5e32586bf1968868/ui/compositor/layer.cc

Thanks, Nikhil.