chromium/chrome/test/data/extensions/manifest_tests/init_invalid_platform_app_5.json

{
  "name": "Platform Test",
  "manifest_version": 2,
  "version": "1",
  "app": {
    "background": {
      "page": "background.html"
    }
  },
  // "background.page" outside of "app"
  "background": {
    "page": "background.html"
  }
}