Drop support for older Barback versions.

test/transformer/loads_a_lazy_aggregate_transformer_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library pub_tests;
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
@@ skipping 24 matching lines @@
   }
 
   void declareOutputs(DeclaringAggregateTransform transform) {
     transform.declareOutput(new AssetId(transform.package,
         p.url.join(transform.key, 'out.txt')));
   }
 }
 """;
 
 main() {
-  withBarbackVersions(">=0.14.1", () {
-    integration("loads a lazy aggregate transformer", () {
-      d.dir(appPath, [
-        d.pubspec({
-          "name": "myapp",
-          "transformers": ["myapp"]
-        }),
-        d.dir("lib", [
-          d.file("transformer.dart", AGGREGATE_TRANSFORMER),
-        ]),
-        d.dir("web", [
-          d.file("foo.txt", "foo"),
-          d.file("bar.txt", "bar")
-        ])
-      ]).create();
+  integration("loads a lazy aggregate transformer", () {
+    d.dir(appPath, [
+      d.pubspec({
+        "name": "myapp",
+        "transformers": ["myapp"]
+      }),
+      d.dir("lib", [
+        d.file("transformer.dart", AGGREGATE_TRANSFORMER),
+      ]),
+      d.dir("web", [
+        d.file("foo.txt", "foo"),
+        d.file("bar.txt", "bar")
+      ])
+    ]).create();
 
-      createLockFile('myapp', pkg: ['barback']);
+    createLockFile('myapp', pkg: ['barback']);
 
-      var server = pubServe();
-      // The transformer should preserve laziness.
-      server.stdout.expect("Build completed successfully");
+    var server = pubServe();
+    // The transformer should preserve laziness.
+    server.stdout.expect("Build completed successfully");
 
-      requestShouldSucceed("out.txt", "bar\nfoo");
-      endPubServe();
-    });
+    requestShouldSucceed("out.txt", "bar\nfoo");
+    endPubServe();
   });
 }