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We used to support sync registrations having various types of network
conditions under which they would fire. That's not specced and it's
unused, so removing it.

Bug: 901034
Change-Id: I38fb1cf2779aebe8814f7bb1bf5564f467397149
Reviewed-on: https://chromium-review.googlesource.com/c/1313191
Commit-Queue: Josh Karlin <jkarlin@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605448}