GitLab

Adds a missing #undef that is required now that jumbo re-introduced
header guards on some of these files.

Change-Id: Id17dd83a83236832fefd7cab266afaa1c850eaee
Reviewed-on: https://chromium-review.googlesource.com/721731Reviewed-by: Daniel Bratell <bratell@opera.com>
Reviewed-by: Martin Barbella <mbarbella@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509423}