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This CL ports over the kiosk app management modal from the existing
extensions page to the MD extensions page.

Bug: 764943
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ib35d989227aa023dc08673fb54d8f38275abad80
Reviewed-on: https://chromium-review.googlesource.com/671905
Commit-Queue: Scott Chen <scottchen@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505122}