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fileSystem's "default_parent" entry has the same fields as some of its
children, so those children's fields don't need to be manually specified.

See chrome/common/extensions/api/_features.md and crrev.com/2939833002.

Bug: 729713
Change-Id: I1eed160c01fb139d1c1b75217e10a343a6308f24
Reviewed-on: https://chromium-review.googlesource.com/575912
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488039}