Remove deprecated priority-less SequencedWorkerPool constructor.

And migrate one callsite missed in https://codereview.chromium.org/2077413009:
 - arc_process_service.cc

After last two callers are removed:
 - https://codereview.chromium.org/2103883004
 - https://codereview.chromium.org/2197753002/

BUG=622400
TBR=danakj@chromium.org

Review-Url: https://codereview.chromium.org/2199353002
Cr-Commit-Position: refs/heads/master@{#411905}


CrOS-Libchrome-Original-Commit: baf03c214ffd661fd81c0e5e374f7e659d74873f
2 files changed
tree: fd182269fce1955d326b83554cc38f9033cde783
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/