block-layout-inline-children-replaced.html is flaky.

TBR=leviw@chromium.org
BUG=320139

Review URL: https://codereview.chromium.org/358463002

git-svn-id: svn://svn.chromium.org/blink/trunk@176857 bbb929c8-8fbe-4397-9dbb-9b2b20218538