TaskScheduler: Remove OnMainExit from SchedulerWorkerThread::Delegate.

We planned to used this method to reset TLS, but we realized that
this is done automatically.

BUG=553459

Review URL: https://codereview.chromium.org/1869393002

Cr-Commit-Position: refs/heads/master@{#386202}


CrOS-Libchrome-Original-Commit: 73e26dbb8c32c4122a80e04a292b409b7a1991d8
3 files changed
tree: 2fde4d2c5bd3beae8441d7238f71298515e9756c
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/