feat(client): remove unneeded HTTP/1 executor (#3108)

BREAKING CHANGE: The method
  `hyper::client::conn::http1::Builder::executor()` is removed, since it did nothing.

src/client/conn/http1.rs

@@ -2,7 +2,6 @@
 
 use std::error::Error as StdError;
 use std::fmt;
-use std::sync::Arc;
 
 use bytes::Bytes;
 use http::{Request, Response};
@@ -12,11 +11,9 @@ use tokio::io::{AsyncRead, AsyncWrite};
 use super::super::dispatch;
 use crate::body::{Body, Incoming as IncomingBody};
 use crate::common::{
-    exec::{BoxSendFuture, Exec},
     task, Future, Pin, Poll,
 };
 use crate::proto;
-use crate::rt::Executor;
 use crate::upgrade::Upgraded;
 
 type Dispatcher<T, B> =
@@ -102,7 +99,6 @@ where
 /// After setting options, the builder is used to create a handshake future.
 #[derive(Clone, Debug)]
 pub struct Builder {
-    pub(super) exec: Exec,
     h09_responses: bool,
     h1_parser_config: ParserConfig,
     h1_writev: Option<bool>,
@@ -289,7 +285,6 @@ impl Builder {
     #[inline]
     pub fn new() -> Builder {
         Builder {
-            exec: Exec::Default,
             h09_responses: false,
             h1_writev: None,
             h1_read_buf_exact_size: None,
@@ -302,15 +297,6 @@ impl Builder {
         }
     }
 
-    /// Provide an executor to execute background HTTP1 tasks.
-    pub fn executor<E>(&mut self, exec: E) -> &mut Builder
-    where
-        E: Executor<BoxSendFuture> + Send + Sync + 'static,
-    {
-        self.exec = Exec::Executor(Arc::new(exec));
-        self
-    }
-
     /// Set whether HTTP/0.9 responses should be tolerated.
     ///
     /// Default is false.

src/ffi/client.rs

@@ -65,11 +65,10 @@ ffi_fn! {
                         }));
                         hyper_clientconn { tx: Tx::Http2(tx) }
                     });
-            }
+                }
             }
 
             conn::http1::Builder::new()
-                .executor(options.exec.clone())
                 .allow_obsolete_multiline_headers_in_responses(options.http1_allow_obsolete_multiline_headers_in_responses)
                 .preserve_header_case(options.http1_preserve_header_case)
                 .preserve_header_order(options.http1_preserve_header_order)

src/server/conn/http1.rs

@@ -35,7 +35,7 @@ pin_project_lite::pin_project! {
 /// A configuration builder for HTTP/1 server connections.
 #[derive(Clone, Debug)]
 pub struct Builder {
-    pub(crate) timer: Time,
+    timer: Time,
     h1_half_close: bool,
     h1_keep_alive: bool,
     h1_title_case_headers: bool,

tests/server.rs

@@ -3029,7 +3029,6 @@ impl TestClient {
             sender.send_request(req).await
         } else {
             let (mut sender, conn) = hyper::client::conn::http1::Builder::new()
-                .executor(TokioExecutor)
                 .handshake(stream)
                 .await
                 .unwrap();