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This reverts commit a65d1637.

Reason for revert:
https://chromium-review.googlesource.com/c/chromium/src/+/2087971
was reverted.

Original change's description:
> Remove unused headers in task_runner_util.h after fixing IWYU
> 
> Follow-up to https://chromium-review.googlesource.com/c/chromium/src/+/2076423
> After https://chromium-review.googlesource.com/c/chromium/src/+/2087971
> and https://chromium-review.googlesource.com/c/chromium/src/+/2087892
> 
> R=​ajwong@chromium.org
> 
> Bug: 1026641
> Change-Id: Ia2c180759677a51502c5c1c04508d165f7c35856
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087893
> Commit-Queue: Gabriel Charette <gab@chromium.org>
> Reviewed-by: Albert J. Wong <ajwong@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#747707}

TBR=ajwong@chromium.org,gab@chromium.org

Change-Id: Id2b54936ec594834407e3e78e9affee53fca8f19
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1026641
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2092036Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747817}