message: Define cricket::DtlsTransportState in terms of webrtc::DtlsTransportState.
  This is one step in getting rid of cricket::DtlsTransportState..
  Cr-Commit-Position: refs/heads/master@{#33991}
diff: @@ -34,15 +34,17 @@ namespace cricket {
  enum DtlsTransportState {
  // Haven't started negotiating.
  - DTLS_TRANSPORT_NEW = 0,
  + DTLS_TRANSPORT_NEW = static_cast<int>(webrtc::DtlsTransportState::kNew),
  // Have started negotiating.
  - DTLS_TRANSPORT_CONNECTING,
  + DTLS_TRANSPORT_CONNECTING =
  + static_cast<int>(webrtc::DtlsTransportState::kConnecting),
  // Negotiated, and has a secure connection.
  - DTLS_TRANSPORT_CONNECTED,
  + DTLS_TRANSPORT_CONNECTED =
  + static_cast<int>(webrtc::DtlsTransportState::kConnected),
  // Transport is closed.
  - DTLS_TRANSPORT_CLOSED,
  + DTLS_TRANSPORT_CLOSED = static_cast<int>(webrtc::DtlsTransportState::kClosed),
  // Failed due to some error in the handshake process.
  - DTLS_TRANSPORT_FAILED,
  + DTLS_TRANSPORT_FAILED = static_cast<int>(webrtc::DtlsTransportState::kFailed),
  };
  webrtc::DtlsTransportState ConvertDtlsTransportState(
  