Refactor PageSchedulerImpl tests.

- Removed cc::OrderedSimpleTaskRunner.
- Removed redundant test fixture.
- WTF::Bind --> base::BindOnce.

Bug: 841735
Change-Id: Iada37d1c7ad60149eb9a933b5968b6101a76bebc
Reviewed-on: https://chromium-review.googlesource.com/1092864
Commit-Queue: Greg Kraynov <kraynov@chromium.org>
Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565635}
1 file changed