This fixes member initialization order and unused private member
warnings that broke the Clang build after the last Angle roll.

BUG=82385

Change-Id: If866f352bda6d66093c180fdbec6c16bf902b628
Reviewed-on: https://chromium-review.googlesource.com/320466Reviewed-by: Nico Weber <thakis@chromium.org>
Tryjob-Request: Nico Weber <thakis@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tryjob-Request: Geoff Lang <geofflang@chromium.org>
Tested-by: Nico Weber <thakis@chromium.org>