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There is currently a CHECK that no more than 1000 BLOCK_SHUTDOWN tasks
are posted during shutdown. The goal of this CHECK is to prevent
shutdown hangs caused by components that behave badly (e.g. a component
that reposts a BLOCK_SHUTDOWN task at the end of each BLOCK_SHUTDOWN
task).

This CL removes this CHECK because:
- It is redundant with the hang watcher.
- Unlike the failures reported by the hang watcher, the failures
  reported by this CHECK aren't necessarily associated with user pain
  (e.g. posting more than 1000 very short BLOCK_SHUTDOWN tasks during
  shutdown will probably not be noticed by the user if it doesn't
  trigger the hang watcher).

Bug: 897334
Change-Id: I6c0ce508c5bd892724a92add3025afe9019a35e7
Reviewed-on: https://chromium-review.googlesource.com/c/1318173Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605461}