Clang warning fixes 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/320466 Reviewed-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>