chromium/chrome/test/data/chromeos/app_mode/apps_and_extensions/external_update/bad_manifest/external_update.json

// Dictionary of external kiosk extensions to be updated.  Each entry maps
// the extension's id to its crx's path (relative to this file) and the version
// of the extension contained in the crx.
{
  "iiigpodgfihagabpagjehoocpakbnclp" : {
    "external_crx": "iiigpodgfihagabpagjehoocpakbnclp-2.0.0.crx",
    "external_version": "2.0.0"
  //}  make this an invalid json file
}