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registration.

Manifest-only schemas don't need to go through api_registration (which
generates api function registration) and generated_api_json_strings
(which generates api schema strings) build steps. Exclude them from the
same. This also helps ensure we don't redundantly generated schema
strings for these apis.

BUG=1113513

Change-Id: I69c39cda6a6ac78fd47e6bf01e44110e221bb76a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380614
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810117}