MdePkg[all]  1.08
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gEfiUsbIoProtocolGuid

Include/Protocol/UsbIo.h

PROTOCOL Information

PROTOCOL's Guid NamePROTOCOL's Guid
gEfiUsbIoProtocolGuid{ 0x2B2F68D6, 0x0CD2, 0x44CF, { 0x8E, 0x8B, 0xBB, 0xA2, 0x0B, 0x1B, 0x5B, 0x75 }}

Refer to Header File

MdePkg/Include/Protocol/UsbIo.h