Is ovrHMD_CreateDebug deprecated starting SDK version 0.6.0

Hi,
When I was developing with SDK 0.5.0, I could use ovrHmd_CreateDebug(ovrHmd_DK2) to emulate a HMD when I don't have real HMD.
But starting SDK 0.6.0, I could not open Oculus world demo as error says "failed debug HMD creation"
I can see

result = ovrHmd_CreateDebug(ovrHmd_DK2, &HMD);

is still being called in Oculus sample, but returns false.
And in SDK 0.7.0, I think ovrHmd_CreateDebug is removed.
So is creating debug HMD deprecated starting SDK 0.6.0?
Does mean I need a real HMD to develop?
Thank you.