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

sdk/lib/_internal/pub_generated/test/cache/add/adds_latest_matching_version_test.dart

Index: sdk/lib/_internal/pub_generated/test/cache/add/adds_latest_matching_version_test.dart
diff --git a/sdk/lib/_internal/pub/test/cache/add/adds_latest_matching_version_test.dart b/sdk/lib/_internal/pub_generated/test/cache/add/adds_latest_matching_version_test.dart
similarity index 58%
copy from sdk/lib/_internal/pub/test/cache/add/adds_latest_matching_version_test.dart
copy to sdk/lib/_internal/pub_generated/test/cache/add/adds_latest_matching_version_test.dart
index f602a31c81f225cac4590d845812595711589dfd..cea5e2ca791f53b41f24c555739ae07db1785b24 100644
--- a/sdk/lib/_internal/pub/test/cache/add/adds_latest_matching_version_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/cache/add/adds_latest_matching_version_test.dart
@@ -9,8 +9,9 @@ import '../../test_pub.dart';
 
 main() {
   initConfig();
-  integration('adds the latest version of the package matching the '
-              'version constraint', () {
+  integration(
+      'adds the latest version of the package matching the ' 'version constraint',
+      () {
     servePackages((builder) {
       builder.serve("foo", "1.2.2");
       builder.serve("foo", "1.2.3");
@@ -18,14 +19,17 @@ main() {
       builder.serve("foo", "2.0.0");
     });
 
-    schedulePub(args: ["cache", "add", "foo", "-v", ">=1.0.0 <2.0.0"],
+    schedulePub(
+        args: ["cache", "add", "foo", "-v", ">=1.0.0 <2.0.0"],
         output: 'Downloading foo 1.2.3...');
 
-    d.cacheDir({"foo": "1.2.3"}).validate();
-    d.hostedCache([
-      d.nothing("foo-1.2.2"),
-      d.nothing("foo-2.0.0-dev"),
-      d.nothing("foo-2.0.0")
-    ]).validate();
+    d.cacheDir({
+      "foo": "1.2.3"
+    }).validate();
+    d.hostedCache(
+        [
+            d.nothing("foo-1.2.2"),
+            d.nothing("foo-2.0.0-dev"),
+            d.nothing("foo-2.0.0")]).validate();
   });
 }