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Use the ash::Shell aura::Env in single-process mash ui_devtools.
Keep a TODO for initializing ui_devtools in Ash for multi-process Mash.
Encapsulate server init, and the switch and port definitions.

Bug: 896977
Test: ui_devtools works well on Chrome OS single-process Mash.
Change-Id: I3cc285d5f8ee465d45795a3521e7e4eafa354414
Reviewed-on: https://chromium-review.googlesource.com/c/1324373
Commit-Queue: Michael Wasserman <msw@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607408}