Migrate LogoTracker to TaskScheduler API.

Bug: 667892
Change-Id: Icaaef380816473c677cf0cbf9fd24e98dafd8325
Reviewed-on: https://chromium-review.googlesource.com/558919
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#484947}
8 files changed