Remove unused CloudPolicyManager::io_task_runner_

This member seems to be unused since crrev.com/c/1139229.

Bug: 1006860
Change-Id: I8e456ddceb4313e920fc8604026bc13396cb44a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1818484
Reviewed-by: Alexander Hendrich <hendrich@chromium.org>
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698971}
1 file changed