Remove barback from the repo.

sdk/lib/_internal/pub/test/serve_packages.dart

Index: sdk/lib/_internal/pub/test/serve_packages.dart
diff --git a/sdk/lib/_internal/pub/test/serve_packages.dart b/sdk/lib/_internal/pub/test/serve_packages.dart
index 607efd3840cb438b190dc122386820d69ce0094f..35c970f78cac4955bdd506f57b8b4809fb8fddc4 100644
--- a/sdk/lib/_internal/pub/test/serve_packages.dart
+++ b/sdk/lib/_internal/pub/test/serve_packages.dart
@@ -153,8 +153,9 @@ class PackageServerBuilder {
       if (_packages.containsKey(name)) return;
       _packages[name] = [];
 
+      var root = packagePath(name);
       var pubspec = new Map.from(loadYaml(
-          readTextFile(p.join(repoRoot, 'pkg', name, 'pubspec.yaml'))));
+          readTextFile(p.join(root, 'pubspec.yaml'))));
 
       // Remove any SDK constraints since we don't have a valid SDK version
       // while testing.
@@ -162,8 +163,7 @@ class PackageServerBuilder {
 
       _packages[name].add(new _ServedPackage(pubspec, [
         d.file('pubspec.yaml', yaml(pubspec)),
-        new d.DirectoryDescriptor.fromFilesystem('lib',
-            p.join(repoRoot, 'pkg', name, 'lib'))
+        new d.DirectoryDescriptor.fromFilesystem('lib', p.join(root, 'lib'))
       ]));
 
       if (pubspec.containsKey('dependencies')) {