[LayoutNG] Use legacy fallback for -webkit-box and -webkit-inline-box

This patch forces legacy fallback for -webkit-box and
-webkit-inline-box.

Bug: 635619
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: I15c35df5e71c03a2df6b466e2ba2197f48d5e588
Reviewed-on: https://chromium-review.googlesource.com/1089591
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566742}
3 files changed