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As discussed previously, people who care about mobile data usage can
limit mobile data usage from the app, so we can remove the warning
dialog for now and see if there is any feedback lamenting its loss.

Bug: 868194
Change-Id: I3efb1adb10b4207c67605c68195d480fbe7a7b3a
Reviewed-on: https://chromium-review.googlesource.com/1152547Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578874}