ozone: Migrate to base::{Once,Repeating}Callback as appropriate

Bug: 714018
Test: CQ & run chrome on eve

Change-Id: I7f6bb7a0165d99fb1890cdaa4e893f1fbb28ff51
Reviewed-on: https://chromium-review.googlesource.com/1026417
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553709}
12 files changed