This allows to enable -Wmissing-field-initializers in a future CL.

Change-Id: I67ac828be97bf4f283e97486981adebaf8e4ebf9
Reviewed-on: https://chromium-review.googlesource.com/957731
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51904}