Refactor: Reformat background_scheduler to make functions more clearly part of namespace

They previously looked a bit like class member functions, so I was hoping this change could make this more clear.

Bug: 896479
Change-Id: I797008b96cdfe9c97f72d5818d1c2acd7c57d341
Reviewed-on: https://chromium-review.googlesource.com/c/1374694
Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616379}
1 file changed