Re-add missing pub tests.

sdk/lib/_internal/pub/test/serve/web_socket/url_to_asset_id_with_line_test.dart

Index: sdk/lib/_internal/pub/test/serve/web_socket/url_to_asset_id_with_line_test.dart
diff --git a/sdk/lib/_internal/pub/test/serve/web_socket/path_to_urls_with_line_test.dart b/sdk/lib/_internal/pub/test/serve/web_socket/url_to_asset_id_with_line_test.dart
similarity index 68%
copy from sdk/lib/_internal/pub/test/serve/web_socket/path_to_urls_with_line_test.dart
copy to sdk/lib/_internal/pub/test/serve/web_socket/url_to_asset_id_with_line_test.dart
index 04bfda5abea082070c19fb78f0f7089888028863..4c5cb4d14417ddfe3a85d2eefbce885c45c879d7 100644
--- a/sdk/lib/_internal/pub/test/serve/web_socket/path_to_urls_with_line_test.dart
+++ b/sdk/lib/_internal/pub/test/serve/web_socket/url_to_asset_id_with_line_test.dart
@@ -4,33 +4,33 @@
 
 library pub_tests;
 
-import 'package:path/path.dart' as p;
 import 'package:scheduled_test/scheduled_test.dart';
-
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 import '../utils.dart';
 
 main() {
   initConfig();
-  integration("pathToUrls provides output line if given source", () {
+  integration("provides output line number if given source one", () {
     d.dir(appPath, [
       d.appPubspec(),
       d.dir("web", [
-        d.file("main.dart", "main"),
+        d.file("main.dart", "main")
       ])
     ]).create();
 
     pubServe();
 
-    expectWebSocketResult("pathToUrls", {
-      "path": p.join("web", "main.dart"),
+    // Paths in web/.
+    expectWebSocketResult("urlToAssetId", {
+      "url": getServerUrl("web", "main.dart"),
       "line": 12345
     }, {
-      "urls": [getServerUrl("web", "main.dart")],
+      "package": "myapp",
+      "path": "web/main.dart",
       "line": 12345
     });
 
     endPubServe();
   });
-}
+}