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Perform disk operations in SequencedTaskRunner

BUG=b:170346308
TEST=activate ambient mode, lock screen

Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome
Change-Id: I5faefd46e74e6ec8ae7061d56e7f6abd0c80326f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2460796
Commit-Queue: Jeffrey Young <cowmoo@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815959}