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While we sort out converting ShelfIntegrationTestApi I'm removing the
dependency on services/ws/common/switches. Specifically,
ShelfIntegrationTestApi is only exposed if a switched defined in
services/ws was supplied. This adds the switch to the ash side in the
short term.

This also removes some unnecessary includes/deps on services/ws.

BUG:960503, 958247
TEST=none

Change-Id: Ibcda3b4fa17de19fc2f6382c3df2d8beca9e2aee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1616784Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660870}