Re: [PATCH v3 0/7] MR1714: cryptowinrt: Implement IKeyCredentialManagerStatics_IsSupportedAsync.

[Mohamad Al-Jaf (＠maljaf)]

**v3**
- Remove commented out imports in windows.security.credentials.idl.
- Move #define WIDL_using_Windows_Storage_Streams to private.h.
- Add tests after implementation of IsSupportedAsync.
- Fix IsSupportedAsync test.