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

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

Index: sdk/lib/_internal/pub_generated/test/snapshot/snapshots_transformed_code_test.dart
diff --git a/sdk/lib/_internal/pub/test/snapshot/snapshots_transformed_code_test.dart b/sdk/lib/_internal/pub_generated/test/snapshot/snapshots_transformed_code_test.dart
similarity index 71%
copy from sdk/lib/_internal/pub/test/snapshot/snapshots_transformed_code_test.dart
copy to sdk/lib/_internal/pub_generated/test/snapshot/snapshots_transformed_code_test.dart
index 7c35cdc38be21baffdefe94d34381a46e85c70ea..6defffb7e82e7c66e4c4fb5025a55cb44ff72436 100644
--- a/sdk/lib/_internal/pub/test/snapshot/snapshots_transformed_code_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/snapshot/snapshots_transformed_code_test.dart
@@ -35,28 +35,32 @@ main() {
     servePackages((builder) {
       builder.serveRepoPackage('barback');
 
-      builder.serve("foo", "1.2.3",
-          deps: {"barback": "any"},
-          pubspec: {'transformers': ['foo']},
+      builder.serve("foo", "1.2.3", deps: {
+        "barback": "any"
+      }, pubspec: {
+        'transformers': ['foo']
+      },
           contents: [
-        d.dir("lib", [d.file("foo.dart", REPLACE_TRANSFORMER)]),
-        d.dir("bin", [
-          d.file("hello.dart", """
+              d.dir("lib", [d.file("foo.dart", REPLACE_TRANSFORMER)]),
+              d.dir("bin", [d.file("hello.dart", """
 final message = 'REPLACE ME';
 
 void main() => print(message);
-"""),
-        ])
-      ]);
+"""),])]);
     });
 
-    d.appDir({"foo": "1.2.3"}).create();
+    d.appDir({
+      "foo": "1.2.3"
+    }).create();
 
     pubGet(output: contains("Precompiled foo:hello."));
 
-    d.dir(p.join(appPath, '.pub', 'bin'), [
-      d.dir('foo', [d.matcherFile('hello.dart.snapshot', contains('hello!'))])
-    ]).validate();
+    d.dir(
+        p.join(appPath, '.pub', 'bin'),
+        [
+            d.dir(
+                'foo',
+                [d.matcherFile('hello.dart.snapshot', contains('hello!'))])]).validate();
 
     var process = pubRun(args: ['foo:hello']);
     process.stdout.expect("hello!");