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Turns out we'll need it afterall since some ios code
uses NonNestable tasks, e.g. indirectly via DeleteSoon.

Bug: 867421, 878356
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I77c0161b083c987f48b0f3270490e8feee241b18
Reviewed-on: https://chromium-review.googlesource.com/1216564Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590269}