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

sdk/lib/_internal/pub_generated/test/get/hosted/do_not_upgrade_on_removed_constraints_test.dart

Index: sdk/lib/_internal/pub_generated/test/get/hosted/do_not_upgrade_on_removed_constraints_test.dart
diff --git a/sdk/lib/_internal/pub/test/get/hosted/do_not_upgrade_on_removed_constraints_test.dart b/sdk/lib/_internal/pub_generated/test/get/hosted/do_not_upgrade_on_removed_constraints_test.dart
similarity index 64%
copy from sdk/lib/_internal/pub/test/get/hosted/do_not_upgrade_on_removed_constraints_test.dart
copy to sdk/lib/_internal/pub_generated/test/get/hosted/do_not_upgrade_on_removed_constraints_test.dart
index 9c65587ddcbfbbd9b835894a71dbea531b04c99a..b3da83d57383eb01417a5ef63b3d91481dcfe2c3 100644
--- a/sdk/lib/_internal/pub/test/get/hosted/do_not_upgrade_on_removed_constraints_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/get/hosted/do_not_upgrade_on_removed_constraints_test.dart
@@ -9,16 +9,24 @@ import '../../test_pub.dart';
 
 main() {
   initConfig();
-  integration("doesn't upgrade dependencies whose constraints have been "
-      "removed", () {
+  integration(
+      "doesn't upgrade dependencies whose constraints have been " "removed",
+      () {
     servePackages((builder) {
-      builder.serve("foo", "1.0.0", deps: {"shared-dep": "any"});
-      builder.serve("bar", "1.0.0", deps: {"shared-dep": "<2.0.0"});
+      builder.serve("foo", "1.0.0", deps: {
+        "shared-dep": "any"
+      });
+      builder.serve("bar", "1.0.0", deps: {
+        "shared-dep": "<2.0.0"
+      });
       builder.serve("shared-dep", "1.0.0");
       builder.serve("shared-dep", "2.0.0");
     });
 
-    d.appDir({"foo": "any", "bar": "any"}).create();
+    d.appDir({
+      "foo": "any",
+      "bar": "any"
+    }).create();
 
     pubGet();
 
@@ -28,7 +36,9 @@ main() {
       "shared-dep": "1.0.0"
     }).validate();
 
-    d.appDir({"foo": "any"}).create();
+    d.appDir({
+      "foo": "any"
+    }).create();
 
     pubGet();