GitLab

Take advantage of inline member initializers, which are harder to
forget, and operator=, which the compiler generates for us.

Bug: none
Change-Id: I6658cab836444ea74ae237fe3c065edebc400615
Reviewed-on: https://chromium-review.googlesource.com/1003553Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Commit-Queue: David Benjamin <davidben@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549567}