internal/poll: remove unused poll.pollDesc methods

Change-Id: Ic2b20c8238ff0ca5513d32e54ef2945fa4d0c3d2
Reviewed-on: https://go-review.googlesource.com/37033
Run-TryBot: Dave Cheney <dave@cheney.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/internal/poll/fd_poll_runtime.go

@@ -100,14 +100,6 @@ func (pd *pollDesc) waitCanceled(mode int) {
 	runtime_pollWaitCanceled(pd.runtimeCtx, mode)
 }
 
-func (pd *pollDesc) waitCanceledRead() {
-	pd.waitCanceled('r')
-}
-
-func (pd *pollDesc) waitCanceledWrite() {
-	pd.waitCanceled('w')
-}
-
 func convertErr(res int) error {
 	switch res {
 	case 0: