chore: update to bytes 1.0 git branch (#3301)

Updates the code base to track the `bytes` git branch. This is in
preparation for the 1.0 release.

Closes #3058

tokio-util/src/io/stream_reader.rs

@@ -131,7 +131,7 @@ where
         loop {
             if self.as_mut().has_chunk() {
                 // This unwrap is very sad, but it can't be avoided.
-                let buf = self.project().chunk.as_ref().unwrap().bytes();
+                let buf = self.project().chunk.as_ref().unwrap().chunk();
                 return Poll::Ready(Ok(buf));
             } else {
                 match self.as_mut().project().inner.poll_next(cx) {

tokio-util/src/lib.rs

@@ -113,7 +113,7 @@ mod util {
         }
 
         let n = {
-            let dst = buf.bytes_mut();
+            let dst = buf.chunk_mut();
             let dst = unsafe { &mut *(dst as *mut _ as *mut [MaybeUninit<u8>]) };
             let mut buf = ReadBuf::uninit(dst);
             let ptr = buf.filled().as_ptr();
@@ -187,10 +187,10 @@ mod util {
 
         let n = if io.is_write_vectored() {
             let mut slices = [IoSlice::new(&[]); MAX_BUFS];
-            let cnt = buf.bytes_vectored(&mut slices);
+            let cnt = buf.chunks_vectored(&mut slices);
             ready!(io.poll_write_vectored(cx, &slices[..cnt]))?
         } else {
-            ready!(io.poll_write(cx, buf.bytes()))?
+            ready!(io.poll_write(cx, buf.chunk()))?
         };
 
         buf.advance(n);

tokio-util/src/udp/frame.rs

@@ -76,7 +76,7 @@ impl<C: Decoder + Unpin> Stream for UdpFramed<C> {
             let addr = unsafe {
                 // Convert `&mut [MaybeUnit<u8>]` to `&mut [u8]` because we will be
                 // writing to it via `poll_recv_from` and therefore initializing the memory.
-                let buf = &mut *(pin.rd.bytes_mut() as *mut _ as *mut [MaybeUninit<u8>]);
+                let buf = &mut *(pin.rd.chunk_mut() as *mut _ as *mut [MaybeUninit<u8>]);
                 let mut read = ReadBuf::uninit(buf);
                 let ptr = read.filled().as_ptr();
                 let res = ready!(Pin::new(&mut pin.socket).poll_recv_from(cx, &mut read));