Drop support for older Barback versions.

test/transformer/exclusion/works_on_dart2js_test.dart

Index: test/transformer/exclusion/works_on_dart2js_test.dart
diff --git a/test/transformer/exclusion/works_on_dart2js_test.dart b/test/transformer/exclusion/works_on_dart2js_test.dart
index 510e64527e23af82bfa304029f88f2b3f27d13c5..a240502a7ca5396ccb0a3f8b702679f75b2b0447 100644
--- a/test/transformer/exclusion/works_on_dart2js_test.dart
+++ b/test/transformer/exclusion/works_on_dart2js_test.dart
@@ -12,42 +12,40 @@ import '../../test_pub.dart';
 import '../../serve/utils.dart';
 
 main() {
-  withBarbackVersions("any", () {
-    integration("works on the dart2js transformer", () {
-      d.dir(appPath, [
-        d.pubspec({
-          "name": "myapp",
-          "transformers": [
-            {
-              "\$dart2js": {
-                "\$include": ["web/a.dart", "web/b.dart"],
-                "\$exclude": "web/a.dart"
-              }
+  integration("works on the dart2js transformer", () {
+    d.dir(appPath, [
+      d.pubspec({
+        "name": "myapp",
+        "transformers": [
+          {
+            "\$dart2js": {
+              "\$include": ["web/a.dart", "web/b.dart"],
+              "\$exclude": "web/a.dart"
             }
-          ]
-        }),
-        d.dir("web", [
-          d.file("a.dart", "void main() => print('hello');"),
-          d.file("b.dart", "void main() => print('hello');"),
-          d.file("c.dart", "void main() => print('hello');")
-        ])
-      ]).create();
-
-      createLockFile('myapp', pkg: ['barback']);
-
-      var server = pubServe();
-      // Dart2js should remain lazy.
-      server.stdout.expect("Build completed successfully");
-
-      requestShould404("a.dart.js");
-      requestShouldSucceed("b.dart.js", isNot(isEmpty));
-      server.stdout.expect(consumeThrough(emitsLines(
-          "[Info from Dart2JS]:\n"
-          "Compiling myapp|web/b.dart...")));
-      server.stdout.expect(consumeThrough("Build completed successfully"));
-
-      requestShould404("c.dart.js");
-      endPubServe();
-    });
+          }
+        ]
+      }),
+      d.dir("web", [
+        d.file("a.dart", "void main() => print('hello');"),
+        d.file("b.dart", "void main() => print('hello');"),
+        d.file("c.dart", "void main() => print('hello');")
+      ])
+    ]).create();
+
+    createLockFile('myapp', pkg: ['barback']);
+
+    var server = pubServe();
+    // Dart2js should remain lazy.
+    server.stdout.expect("Build completed successfully");
+
+    requestShould404("a.dart.js");
+    requestShouldSucceed("b.dart.js", isNot(isEmpty));
+    server.stdout.expect(consumeThrough(emitsLines(
+        "[Info from Dart2JS]:\n"
+        "Compiling myapp|web/b.dart...")));
+    server.stdout.expect(consumeThrough("Build completed successfully"));
+
+    requestShould404("c.dart.js");
+    endPubServe();
   });
 }