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

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

Index: sdk/lib/_internal/pub_generated/test/cache/add/all_with_some_versions_present_test.dart
diff --git a/sdk/lib/_internal/pub/test/cache/add/all_with_some_versions_present_test.dart b/sdk/lib/_internal/pub_generated/test/cache/add/all_with_some_versions_present_test.dart
similarity index 68%
copy from sdk/lib/_internal/pub/test/cache/add/all_with_some_versions_present_test.dart
copy to sdk/lib/_internal/pub_generated/test/cache/add/all_with_some_versions_present_test.dart
index 3faa1c5aec3ae4b628a7de96f1e5c6b633983228..bdfd5ebd586553d1e224414b5b1558dcb1ba556d 100644
--- a/sdk/lib/_internal/pub/test/cache/add/all_with_some_versions_present_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/cache/add/all_with_some_versions_present_test.dart
@@ -18,23 +18,32 @@ main() {
     });
 
     // Install a couple of versions first.
-    schedulePub(args: ["cache", "add", "foo", "-v", "1.2.1"],
+    schedulePub(
+        args: ["cache", "add", "foo", "-v", "1.2.1"],
         output: 'Downloading foo 1.2.1...');
 
-    schedulePub(args: ["cache", "add", "foo", "-v", "1.2.3"],
+    schedulePub(
+        args: ["cache", "add", "foo", "-v", "1.2.3"],
         output: 'Downloading foo 1.2.3...');
 
     // They should show up as already installed now.
-    schedulePub(args: ["cache", "add", "foo", "--all"],
-        output: '''
+    schedulePub(args: ["cache", "add", "foo", "--all"], output: '''
           Already cached foo 1.2.1.
           Downloading foo 1.2.2...
           Already cached foo 1.2.3.
           Downloading foo 2.0.0...''');
 
-    d.cacheDir({"foo": "1.2.1"}).validate();
-    d.cacheDir({"foo": "1.2.2"}).validate();
-    d.cacheDir({"foo": "1.2.3"}).validate();
-    d.cacheDir({"foo": "2.0.0"}).validate();
+    d.cacheDir({
+      "foo": "1.2.1"
+    }).validate();
+    d.cacheDir({
+      "foo": "1.2.2"
+    }).validate();
+    d.cacheDir({
+      "foo": "1.2.3"
+    }).validate();
+    d.cacheDir({
+      "foo": "2.0.0"
+    }).validate();
   });
 }