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JSON manifests are deprecated.

This also converts the test_ws manifest, as it and ash were the last
remaining uses of service_manifest() GN rules' support for packaged
services.

Bug: 895616
Change-Id: I3bd329e4536bc7356e49977299e19944babb77b7
Reviewed-on: https://chromium-review.googlesource.com/c/1437707
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626802}