All five (alarms, storage-session, web-navigation, ipc-bridge, event-emitter) still matched current source exactly: their targets under apps/desktop/main/chrome-api-polyfills/ import cleanly under plain node (no top-level electron import) and all 62 assertions pass unmodified. So each was fixed (import path backend/electron/... -> main/...) and moved to top-level apps/desktop/tests/unit/ as chrome-polyfill-<name>.test.js so the unit runner glob (tests/unit/*.test.js) actually executes them. The un-globbed tests/unit/chrome-api-polyfills/ directory is gone. Unit suite: 733 pass, 0 fail (was 671; +62 = the five revived suites).