partially integrate streaming request bodies with http re-direct

components/net/http_loader.rs

@@ -973,8 +973,7 @@ fn http_network_or_cache_fetch(
     let http_request = if request_has_no_window && request.redirect_mode == RedirectMode::Error {
         request
     } else {
-        // Step 5.2
-        // TODO Implement body source
+        // Step 5.2.1, .2.2 and .2.3 and 2.4
         http_request = request.clone();
         &mut http_request
     };

components/net/tests/http_loader.rs

@@ -113,11 +113,7 @@ fn create_request_body_with_content(content: Vec<u8>) -> RequestBody {
         }),
     );
 
-    RequestBody {
-        stream: Some(chunk_request_sender),
-        source: BodySource::USVString,
-        total_bytes: Some(content_len),
-    }
+    RequestBody::new(chunk_request_sender, BodySource::Object, Some(content_len))
 }
 
 #[test]