Issue  4457: Fix sending mail when local files are uploaded.
Issue  4457: Fix sending mail when local files are uploaded.

nicko96/Chrome-Infra,riannucci/rietveldv2,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,riannucci/rietveldv2