Remove usage of SequencedWorkerPool in GN.

SequencedWorkerPool is deprecated. A process-wide TaskScheduler
must be used instead.

Bug: 667892
Change-Id: I67f5bafe5e5eaba3aeb40664dea7cdd7d4250b60
Reviewed-on: https://chromium-review.googlesource.com/879354
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#531270}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: cb4f92cc31ff0e1e598b8e023a40a0409a766a60
22 files changed
tree: 9b52dfabc1430492f409d4169339955dd5d3fc85
  1. tools/