Remove base::WorkerPool.

This class is deprecated and no longer used.

TBR=agl@chromium.org,holte@chromium.org

Bug: 659191, 251774
Change-Id: I111c334d3feac302abd14aa9d4d142aa237a00b4
Reviewed-on: https://chromium-review.googlesource.com/650368
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504708}

CrOS-Libchrome-Original-Commit: f3d1fac07f11ac72488779fd03cf55310e7f2458
8 files changed
tree: f98c07d28f9d86bd868d3b8b77888e620f4e849f
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/