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

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

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library pub_tests;
 
 import 'package:path/path.dart' as p;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 main() {
   initConfig();
   integration("upgrades a snapshot when a git dependency is upgraded", () {
     ensureGit();
 
-    d.git('foo.git', [
-      d.pubspec({
+    d.git('foo.git', [d.pubspec({
         "name": "foo",
         "version": "0.0.1"
       }),
-      d.dir("bin", [
-        d.file("hello.dart", "void main() => print('Hello!');")
-      ])
-    ]).create();
+          d.dir(
+              "bin",
+              [d.file("hello.dart", "void main() => print('Hello!');")])]).create();
 
-    d.appDir({"foo": {"git": "../foo.git"}}).create();
+    d.appDir({
+      "foo": {
+        "git": "../foo.git"
+      }
+    }).create();
 
     pubGet(output: contains("Precompiled foo:hello."));
 
-    d.dir(p.join(appPath, '.pub', 'bin', 'foo'), [
-      d.matcherFile('hello.dart.snapshot', contains('Hello!'))
-    ]).validate();
+    d.dir(
+        p.join(appPath, '.pub', 'bin', 'foo'),
+        [d.matcherFile('hello.dart.snapshot', contains('Hello!'))]).validate();
 
-    d.git('foo.git', [
-      d.dir("bin", [
-        d.file("hello.dart", "void main() => print('Goodbye!');")
-      ])
-    ]).commit();
+    d.git(
+        'foo.git',
+        [
+            d.dir(
+                "bin",
+                [d.file("hello.dart", "void main() => print('Goodbye!');")])]).commit();
 
     pubUpgrade(output: contains("Precompiled foo:hello."));
 
-    d.dir(p.join(appPath, '.pub', 'bin', 'foo'), [
-      d.matcherFile('hello.dart.snapshot', contains('Goodbye!'))
-    ]).validate();
+    d.dir(
+        p.join(appPath, '.pub', 'bin', 'foo'),
+        [d.matcherFile('hello.dart.snapshot', contains('Goodbye!'))]).validate();
 
     var process = pubRun(args: ['foo:hello']);
     process.stdout.expect("Goodbye!");
     process.shouldExit();
   });
 }