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

sdk/lib/_internal/pub_generated/test/upgrade/git/upgrade_to_nonexistent_pubspec_test.dart

Index: sdk/lib/_internal/pub_generated/test/upgrade/git/upgrade_to_nonexistent_pubspec_test.dart
diff --git a/sdk/lib/_internal/pub/test/upgrade/git/upgrade_to_nonexistent_pubspec_test.dart b/sdk/lib/_internal/pub_generated/test/upgrade/git/upgrade_to_nonexistent_pubspec_test.dart
similarity index 51%
copy from sdk/lib/_internal/pub/test/upgrade/git/upgrade_to_nonexistent_pubspec_test.dart
copy to sdk/lib/_internal/pub_generated/test/upgrade/git/upgrade_to_nonexistent_pubspec_test.dart
index b9bd476b83a0f1e502dc681eac184f7cffc71564..0a747570aee3f01f32dbe82aa4d6d262fca49c1d 100644
--- a/sdk/lib/_internal/pub/test/upgrade/git/upgrade_to_nonexistent_pubspec_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/upgrade/git/upgrade_to_nonexistent_pubspec_test.dart
@@ -12,32 +12,31 @@ main() {
   integration("upgrades Git packages to a nonexistent pubspec", () {
     ensureGit();
 
-    var repo = d.git('foo.git', [
-      d.libDir('foo'),
-      d.libPubspec('foo', '1.0.0')
-    ]);
+    var repo =
+        d.git('foo.git', [d.libDir('foo'), d.libPubspec('foo', '1.0.0')]);
     repo.create();
 
-    d.appDir({"foo": {"git": "../foo.git"}}).create();
+    d.appDir({
+      "foo": {
+        "git": "../foo.git"
+      }
+    }).create();
 
     pubGet();
 
-    d.dir(packagesPath, [
-      d.dir('foo', [
-        d.file('foo.dart', 'main() => "foo";')
-      ])
-    ]).validate();
+    d.dir(
+        packagesPath,
+        [d.dir('foo', [d.file('foo.dart', 'main() => "foo";')])]).validate();
 
     repo.runGit(['rm', 'pubspec.yaml']);
     repo.runGit(['commit', '-m', 'delete']);
 
-    pubUpgrade(error: new RegExp(r'Could not find a file named "pubspec.yaml" '
-        r'in "[^\n]*"\.'));
+    pubUpgrade(
+        error: new RegExp(
+            r'Could not find a file named "pubspec.yaml" ' r'in "[^\n]*"\.'));
 
-    d.dir(packagesPath, [
-      d.dir('foo', [
-        d.file('foo.dart', 'main() => "foo";')
-      ])
-    ]).validate();
+    d.dir(
+        packagesPath,
+        [d.dir('foo', [d.file('foo.dart', 'main() => "foo";')])]).validate();
   });
 }