Drop support for older Barback versions.

test/serve/does_not_crash_if_an_unused_dart_file_has_a_syntax_error_test.dart

Index: test/serve/does_not_crash_if_an_unused_dart_file_has_a_syntax_error_test.dart
diff --git a/test/serve/does_not_crash_if_an_unused_dart_file_has_a_syntax_error_test.dart b/test/serve/does_not_crash_if_an_unused_dart_file_has_a_syntax_error_test.dart
index 2550163e38f985306c5d74c8c41f87f3cc7da865..5758d27b7eb8f44bf13c60d321bb32a9f82f5ba0 100644
--- a/test/serve/does_not_crash_if_an_unused_dart_file_has_a_syntax_error_test.dart
+++ b/test/serve/does_not_crash_if_an_unused_dart_file_has_a_syntax_error_test.dart
@@ -9,27 +9,25 @@ import '../test_pub.dart';
 import 'utils.dart';
 
 main() {
-  withBarbackVersions("any", () {
-    integration("doesn't crash if an unused .dart file has a syntax error", () {
-      d.dir(appPath, [
-        d.pubspec({
-          "name": "myapp",
-          "transformers": ["myapp/src/transformer"]
-        }),
-        d.dir("lib", [d.dir("src", [
-          d.file("transformer.dart", REWRITE_TRANSFORMER),
-          d.file("unused.dart", "(*&^#@")
-        ])]),
-        d.dir("web", [
-          d.file("foo.txt", "foo")
-        ])
-      ]).create();
+  integration("doesn't crash if an unused .dart file has a syntax error", () {
+    d.dir(appPath, [
+      d.pubspec({
+        "name": "myapp",
+        "transformers": ["myapp/src/transformer"]
+      }),
+      d.dir("lib", [d.dir("src", [
+        d.file("transformer.dart", REWRITE_TRANSFORMER),
+        d.file("unused.dart", "(*&^#@")
+      ])]),
+      d.dir("web", [
+        d.file("foo.txt", "foo")
+      ])
+    ]).create();
 
-      createLockFile('myapp', pkg: ['barback']);
+    createLockFile('myapp', pkg: ['barback']);
 
-      var server = pubServe();
-      requestShouldSucceed("foo.out", "foo.out");
-      endPubServe();
-    });
+    var server = pubServe();
+    requestShouldSucceed("foo.out", "foo.out");
+    endPubServe();
   });
 }