Make StreamSubscription be the active part of a stream.

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

Index: sdk/lib/_internal/pub/test/package_files_test.dart
diff --git a/sdk/lib/_internal/pub/test/package_files_test.dart b/sdk/lib/_internal/pub/test/package_files_test.dart
index 36e6832574bf1dee6e2797af2f04d2b58a72e06e..4b7007846547ab2c298b2c31c9fde630f2d60614 100644
--- a/sdk/lib/_internal/pub/test/package_files_test.dart
+++ b/sdk/lib/_internal/pub/test/package_files_test.dart
@@ -93,8 +93,8 @@ main() {
 
       schedule(() {
         expect(entrypoint.packageFiles(), completion(unorderedEquals([
-          path.join(root, 'pubspec.yaml'),
           path.join(root, '.gitignore'),
+          path.join(root, 'pubspec.yaml'),
           path.join(root, 'file2.text'),
           path.join(root, 'subdir', 'subfile2.text')
         ])));
@@ -134,7 +134,6 @@ void commonTests() {
       d.file('pubspec.lock'),
       d.dir('subdir', [d.file('pubspec.lock')])
     ]).create();
-
     schedule(() {
       expect(entrypoint.packageFiles(),
           completion(equals([path.join(root, 'pubspec.yaml')])));