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This change makes it a requirement to pass in TaskTraits to
base::PostDelayedTask(), bringing it in line with the other task posting
APIs.

This patch has no functional changes.

Bug: 968047
Change-Id: I67daf3c1560f9c386578d458a45a3c791786141e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1985773
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Auto-Submit: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742786}