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This reverts commit f37f7fde.

Reason for revert: Let me revert this so that crrev.com/c/1728889 can create
throttles on the IO thread.

Original change's description:
> Remove unused members of ProfileIOData
>
> These are no longer used after http://crrev.com/c/1731919
>
> Bug: 824840
> Change-Id: I7163336861c227fb7fa7aab9fe297898d92067c7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1731180
> Commit-Queue: Clark DuVall <cduvall@chromium.org>
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#683474}

Change-Id: I2b5c64dd5d5548dfe472352a6a1313bee7fa8770
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 824840
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1732519
Auto-Submit: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683502}