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This converts ash to using ServerRemoteViewHost now that it hosts the
WindowService. This also makes WindowServiceOwner create the WindowService
immediately.

BUG=876513
TEST=covered by tests

Change-Id: I7aba636c9e87db4ab08e1ccab97acecacdfc59f9
Reviewed-on: https://chromium-review.googlesource.com/1185796Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585269}