[LayoutNG] owners:glebl->atotic

Bug: 635619
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: I505e2e4e01ffba761a4c4ea2c699f71b9f3ed639
Reviewed-on: https://chromium-review.googlesource.com/963496Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543220}

third_party/WebKit/Source/core/layout/ng/OWNERS

 cbiesinger@chromium.org
 eae@chromium.org
-glebl@chromium.org
 ikilpatrick@chromium.org
+atotic@chromium.org
 
 # TEAM: layout-dev@chromium.org
 # COMPONENT: Blink>Layout