Remove barback from the repo.

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

Index: sdk/lib/_internal/pub_generated/test/serve_packages.dart
diff --git a/sdk/lib/_internal/pub_generated/test/serve_packages.dart b/sdk/lib/_internal/pub_generated/test/serve_packages.dart
index 0b98cf7dd4430529b3cfefb9da29b3dfcf672f91..2fad96dded98a5c2277e9297b17f6c8a1b46167b 100644
--- a/sdk/lib/_internal/pub_generated/test/serve_packages.dart
+++ b/sdk/lib/_internal/pub_generated/test/serve_packages.dart
@@ -148,8 +148,9 @@ class PackageServerBuilder {
       if (_packages.containsKey(name)) return;
       _packages[name] = [];
 
-      var pubspec = new Map.from(
-          loadYaml(readTextFile(p.join(repoRoot, 'pkg', name, 'pubspec.yaml'))));
+      var root = packagePath(name);
+      var pubspec =
+          new Map.from(loadYaml(readTextFile(p.join(root, 'pubspec.yaml'))));
 
       // Remove any SDK constraints since we don't have a valid SDK version
       // while testing.
@@ -160,9 +161,7 @@ class PackageServerBuilder {
               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')) {
         pubspec['dependencies'].keys.forEach(_addPackage);