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There was still some random code in ash depending on services/ws.
This removes most of it (some constants are still used and need to
be moved out of mojoms).

BUG=960503
TEST=none

Change-Id: I32dcc593bd1f680fc39fbbee45840b08903bfa29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1615642Reviewed-by: Jun Mukai <mukai@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660601}