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In case enterprise admin forgets to set the enterprise name, Chrome
will show generic warning text without specific enterprise name.

String doc:
https://docs.google.com/document/d/1A4vVFzhdW3HKyE2uFQIPBy12cpYBxdaW3_rbh9vZxyM

Bug: 824500, 824502
Change-Id: I0917c7ca90d63a2a8746bffd2c4beeeab4f61106
Reviewed-on: https://chromium-review.googlesource.com/1008737
Commit-Queue: Jialiu Lin <jialiul@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550029}