Originally there was not much shared/js put into build layers, but with the notification stuff we picked up notification_helper and at some point I think I updated the mail_app build layer to include gesture_detector. The make_gaia_shared.js could use the build.txt generated by the build and if the shared js dependency that is found via dependency scanning is found in the build.txt file, then do not include it for gaia_shared.json. This is just a good housekeeping bug. Nothing broken, just a slightly bigger .zip file.
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