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We now have schema generation, schema bundle generation, and schema bundle registration generation; the last of these is generated in a separate build target and output to browser rather than common.

Fix a couple of dangling gyp issues also.

BUG=405226
TBR=sky@chromium.org

Review URL: https://codereview.chromium.org/489153003

Cr-Commit-Position: refs/heads/master@{#292057}