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

sdk/lib/_internal/pub_generated/test/snapshot/doesnt_snapshot_transitive_dependencies_test.dart

Index: sdk/lib/_internal/pub_generated/test/snapshot/doesnt_snapshot_transitive_dependencies_test.dart
diff --git a/sdk/lib/_internal/pub/test/snapshot/doesnt_snapshot_transitive_dependencies_test.dart b/sdk/lib/_internal/pub_generated/test/snapshot/doesnt_snapshot_transitive_dependencies_test.dart
similarity index 57%
copy from sdk/lib/_internal/pub/test/snapshot/doesnt_snapshot_transitive_dependencies_test.dart
copy to sdk/lib/_internal/pub_generated/test/snapshot/doesnt_snapshot_transitive_dependencies_test.dart
index 039c7fb66fa7cfce09ad9a4319abbb2e6e7960a8..3ea2d22e9f8397807c0a3c634ef17b05f0783bb3 100644
--- a/sdk/lib/_internal/pub/test/snapshot/doesnt_snapshot_transitive_dependencies_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/snapshot/doesnt_snapshot_transitive_dependencies_test.dart
@@ -12,16 +12,23 @@ import '../test_pub.dart';
 
 main() {
   initConfig();
-  integration("doesn't create a snapshot for transitive dependencies' "
-      "executables", () {
+  integration(
+      "doesn't create a snapshot for transitive dependencies' " "executables",
+      () {
     servePackages((builder) {
-      builder.serve("foo", "1.2.3", deps: {'bar': '1.2.3'});
-      builder.serve("bar", "1.2.3", contents: [
-        d.dir("bin", [d.file("hello.dart", "void main() => print('hello!');")])
-      ]);
+      builder.serve("foo", "1.2.3", deps: {
+        'bar': '1.2.3'
+      });
+      builder.serve(
+          "bar",
+          "1.2.3",
+          contents: [
+              d.dir("bin", [d.file("hello.dart", "void main() => print('hello!');")])]);
     });
 
-    d.appDir({"foo": "1.2.3"}).create();
+    d.appDir({
+      "foo": "1.2.3"
+    }).create();
 
     pubGet();