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This patch makes Ash, when run with ash_shell_with_content, start the
WindowService. It also forces quick_launch to start to make sure
something can be displayed. Lastly, I moved what was
EmbeddedAshService to ash. I would like to make ash create this as
well.

BUG=837689
TEST=most of this change doesn't effect production code

Change-Id: Ia9f651b16a94d5db07dd5dc17e0619c442685597
Reviewed-on: https://chromium-review.googlesource.com/1043392Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556094}