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

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

Index: sdk/lib/_internal/pub_generated/test/snapshot/upgrades_snapshot_for_dependency_test.dart
diff --git a/sdk/lib/_internal/pub/test/snapshot/upgrades_snapshot_for_dependency_test.dart b/sdk/lib/_internal/pub_generated/test/snapshot/upgrades_snapshot_for_dependency_test.dart
similarity index 55%
copy from sdk/lib/_internal/pub/test/snapshot/upgrades_snapshot_for_dependency_test.dart
copy to sdk/lib/_internal/pub_generated/test/snapshot/upgrades_snapshot_for_dependency_test.dart
index 36e4471af8489a1388faf4b37fd3978c7b9e5ba4..0749c5e256575564bd86749876bd250a64aa6525 100644
--- a/sdk/lib/_internal/pub/test/snapshot/upgrades_snapshot_for_dependency_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/snapshot/upgrades_snapshot_for_dependency_test.dart
@@ -15,40 +15,42 @@ main() {
   integration("upgrades a snapshot when a dependency is upgraded", () {
     servePackages((builder) {
       builder.serve("foo", "1.2.3", pubspec: {
-        "dependencies": {"bar": "any"}
-      }, contents: [
-        d.dir("bin", [
-          d.file("hello.dart", """
+        "dependencies": {
+          "bar": "any"
+        }
+      }, contents: [d.dir("bin", [d.file("hello.dart", """
 import 'package:bar/bar.dart';
 
 void main() => print(message);
-""")
-        ])
-      ]);
-      builder.serve("bar", "1.2.3", contents: [
-        d.dir("lib", [d.file("bar.dart", "final message = 'hello!';")])
-      ]);
+""")])]);
+      builder.serve(
+          "bar",
+          "1.2.3",
+          contents: [d.dir("lib", [d.file("bar.dart", "final message = 'hello!';")])]);
     });
 
-    d.appDir({"foo": "any"}).create();
+    d.appDir({
+      "foo": "any"
+    }).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();
 
     servePackages((builder) {
-      builder.serve("bar", "1.2.4", contents: [
-        d.dir("lib", [d.file("bar.dart", "final message = 'hello 2!';")]),
-      ]);
+      builder.serve(
+          "bar",
+          "1.2.4",
+          contents: [d.dir("lib", [d.file("bar.dart", "final message = 'hello 2!';")]),]);
     });
 
     pubUpgrade(output: contains("Precompiled foo:hello."));
 
-    d.dir(p.join(appPath, '.pub', 'bin', 'foo'), [
-      d.matcherFile('hello.dart.snapshot', contains('hello 2!'))
-    ]).validate();
+    d.dir(
+        p.join(appPath, '.pub', 'bin', 'foo'),
+        [d.matcherFile('hello.dart.snapshot', contains('hello 2!'))]).validate();
 
     var process = pubRun(args: ['foo:hello']);
     process.stdout.expect("hello 2!");