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Generated schema strings are primarily used by the renderers to generate
bindings. Exclude 'manifest_keys' since the renderers wouldn't need
these.

BUG=1113513

TEST=Verify that the generated schema strings don't include
'manifest_keys'.

Change-Id: Ibf750b27155b0f851bccb54d80a6093c6ed33458
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2369418
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Auto-Submit: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801634}