Revert "Use native async/await support in pub."

sdk/lib/_internal/pub_generated/test/descriptor/tar.dart

Index: sdk/lib/_internal/pub_generated/test/descriptor/tar.dart
diff --git a/sdk/lib/_internal/pub/test/descriptor/tar.dart b/sdk/lib/_internal/pub_generated/test/descriptor/tar.dart
similarity index 84%
copy from sdk/lib/_internal/pub/test/descriptor/tar.dart
copy to sdk/lib/_internal/pub_generated/test/descriptor/tar.dart
index 2a04a034a9c818d403021f79b69e5c574ce640eb..19280dc8b67f1dea9e1c5c75df4eddb1508b8e71 100644
--- a/sdk/lib/_internal/pub/test/descriptor/tar.dart
+++ b/sdk/lib/_internal/pub_generated/test/descriptor/tar.dart
@@ -13,8 +13,8 @@ import 'package:scheduled_test/descriptor.dart';
 import '../../lib/src/io.dart';
 
 /// Describes a tar file and its contents.
-class TarFileDescriptor extends DirectoryDescriptor
-    implements ReadableDescriptor {
+class TarFileDescriptor extends DirectoryDescriptor implements
+    ReadableDescriptor {
   TarFileDescriptor(String name, List<Descriptor> contents)
       : super(name, contents);
 
@@ -26,9 +26,8 @@ class TarFileDescriptor extends DirectoryDescriptor
       return Future.wait(contents.map((entry) {
         return entry.create(tempDir);
       })).then((_) {
-        var createdContents = listDir(tempDir,
-            recursive: true,
-            includeHidden: true);
+        var createdContents =
+            listDir(tempDir, recursive: true, includeHidden: true);
         return createTarGz(createdContents, baseDir: tempDir).toBytes();
       }).then((bytes) {
         var file = path.join(parent, name);
@@ -46,8 +45,8 @@ class TarFileDescriptor extends DirectoryDescriptor
 
   Stream<List<int>> read() {
     return new Stream<List<int>>.fromFuture(withTempDir((tempDir) {
-      return create(tempDir).then((_) =>
-          readBinaryFile(path.join(tempDir, name)));
+      return create(
+          tempDir).then((_) => readBinaryFile(path.join(tempDir, name)));
     }));
   }
 }