DOC_TYPE_EXCEL    220 net/base/mime_sniffer.cc   OFFICE_EXTENSION(DOC_TYPE_EXCEL, ".xls")
DOC_TYPE_EXCEL    223 net/base/mime_sniffer.cc   OFFICE_EXTENSION(DOC_TYPE_EXCEL, ".xlsx")
DOC_TYPE_EXCEL    487 net/base/mime_sniffer.cc       case DOC_TYPE_EXCEL:
DOC_TYPE_EXCEL    503 net/base/mime_sniffer.cc       case DOC_TYPE_EXCEL: