chromeos: removes some of the window-service mojoms

Some are still in use, so I can't remove them all.

BUG=964460
TEST=none
TBR=palmer@chromium.org

Change-Id: I64cba650dd8a852780fe48c820d38a67276d1f8f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1620385
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661551}
44 files changed