Testing

1. Create a self-signed certificate, e.g. with identity myid, or use the ad-hoc signing identity '-'.
2. autoninja -C out/MyOutDir chrome/updater
3. Copy

     out/MyOutDir/Updater\ Packaging/sign_updater.py --identity myid \
     --development --input out/MyOutDir --output MySignedOutputDir \
     --notarize=none