Bug 1622256 - Replace use of description() with to_string(). r=kvark,jrmuizel

Depends on D66767

Differential Revision: https://phabricator.services.mozilla.com/D66768

--HG--
extra : moz-landing-system : lando

gfx/wr/webrender_api/src/channel.rs

@@ -79,8 +79,7 @@ pub struct MsgReceiver<T> {
 
 impl<T> MsgReceiver<T> {
     pub fn recv(&self) -> Result<T, Error> {
-        use std::error::Error;
-        self.rx.recv().map_err(|e| io::Error::new(ErrorKind::Other, e.description()))
+        self.rx.recv().map_err(|e| io::Error::new(ErrorKind::Other, e.to_string()))
     }
 
     pub fn to_mpsc_receiver(self) -> mpsc::Receiver<T> {