They are properly initialized upon creation.

Cq-Include-Trybots: luci.chromium.try:linux_chromium_headless_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I10ac441580bf957e97ce663c9c3ad268ddeae935
Reviewed-on: https://chromium-review.googlesource.com/1188573
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55492}