func (file *GridFile) SetContentType(ctype string) {
	file.assertMode(gfsWriting)
	file.m.Lock()
	file.doc.ContentType = ctype
	file.m.Unlock()
}
func (file *GridFile) SetContentType(ctype string) {
	file.assertMode(gfsWriting)
	file.m.Lock()
	file.doc.ContentType = ctype
	file.m.Unlock()
}
func ( file * GridFile ) SetContentType ( ctype string ) { file . assertMode ( gfsWriting ) file . m . Lock ( ) file . doc . ContentType = ctype file . m . Unlock ( ) }
// ContentType changes the optional file content type.  An empty string may be
// used to unset it.
//
// It is a runtime error to call this function when the file is not open
// for writing.
ContentType changes the optional file content type . An empty string may be used to unset it . It is a runtime error to call this function when the file is not open for writing .