Also format flags in single lines to make configs easier to read and modify.

BUG=chromium:673246
NOTRY=true
R=mstarzinger@chromium.org,titzer@chromium.org,rmcilroy@chromium.org

Change-Id: If37486c98af161467b639271b035207c3ae1077a
Reviewed-on: https://chromium-review.googlesource.com/452579Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43719}