smbprovider: Add SMB1 unsupported ErrorType Adds an error to the smbprovider::ErrorType enum to be used to differentiate between a generic failure and a failure because a specified share is SMB1 which we do not support. BUG=chromium:757625 TEST=emerges Change-Id: Ia2847f903d471c4015681a04303d2f01ce4310f1 Reviewed-on: https://chromium-review.googlesource.com/1195586 Commit-Ready: Zentaro Kavanagh <[email protected]> Tested-by: Zentaro Kavanagh <[email protected]> Tested-by: Bailey Berro <[email protected]> Reviewed-by: Zentaro Kavanagh <[email protected]>