GitLab

Got rid of cc::OrderedSimpleTaskRunner dependency and slightly
cleaned TaskQueueManagerImpl unittests while adjusting the code.

Bug: 783309
Change-Id: Ibc31281b1dcdf6750b2fcc9e07bc7d7dfe1e85af
Reviewed-on: https://chromium-review.googlesource.com/1037144
Commit-Queue: Greg Kraynov <kraynov@chromium.org>
Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557230}