chore: fix clippy lints (#707)

tonic-web/src/call.rs

@@ -235,7 +235,7 @@ impl Encoding {
         Self::from_header(headers.get(header::ACCEPT))
     }
 
-    pub(crate) fn to_content_type(&self) -> &'static str {
+    pub(crate) fn to_content_type(self) -> &'static str {
         match self {
             Encoding::Base64 => GRPC_WEB_TEXT_PROTO,
             Encoding::None => GRPC_WEB_PROTO,

tonic-web/src/cors.rs

@@ -161,7 +161,7 @@ mod tests {
         ($header:expr, $expected:expr) => {
             fn sorted(value: &str) -> Vec<&str> {
                 let mut vec = value.split(",").collect::<Vec<_>>();
-                vec.sort();
+                vec.sort_unstable();
                 vec
             }
 

tonic-web/tests/integration/tests/grpc.rs

@@ -65,7 +65,7 @@ async fn smoke_server_stream() {
     let r3 = stream(r3).await;
     let r4 = stream(r4).await;
 
-    assert!(&r1 == &r2 && &r2 == &r3 && &r3 == &r4);
+    assert!(r1 == r2 && r2 == r3 && r3 == r4);
 }
 #[tokio::test]
 async fn smoke_error() {