core: remove Transport impl for Box<dyn Transport>

Real users of Box<dyn Transport> most likely want to add other trait
bounds such as Send, which would require the use of a newtype wrapper
anyway.

wayrs-core/src/transport.rs

@@ -47,25 +47,6 @@ pub trait Transport {
     ) -> io::Result<usize>;
 }
 
-impl Transport for Box<dyn Transport> {
-    fn pollable_fd(&self) -> RawFd {
-        self.as_ref().pollable_fd()
-    }
-
-    fn send(&mut self, bytes: &[IoSlice], fds: &[OwnedFd], mode: IoMode) -> io::Result<usize> {
-        self.as_mut().send(bytes, fds, mode)
-    }
-
-    fn recv(
-        &mut self,
-        bytes: &mut [IoSliceMut],
-        fds: &mut VecDeque<OwnedFd>,
-        mode: IoMode,
-    ) -> io::Result<usize> {
-        self.as_mut().recv(bytes, fds, mode)
-    }
-}
-
 impl<T: Transport> AsRawFd for BufferedSocket<T> {
     fn as_raw_fd(&self) -> RawFd {
         self.socket.pollable_fd()