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Drive syncing can be paused when on a cellular connection. Monitor the
pref backing this option and the network connectivity type, and use it
to toggle DriveFS syncing.

Bug: 854155
Change-Id: I0e6602b4055f5bf8926728933b84c78fa2fa19d2
Reviewed-on: https://chromium-review.googlesource.com/1147801Reviewed-by: Stuart Langley <slangley@chromium.org>
Commit-Queue: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577425}