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

sdk/lib/_internal/pub_generated/test/run/mode_test.dart

Index: sdk/lib/_internal/pub_generated/test/run/mode_test.dart
diff --git a/sdk/lib/_internal/pub/test/run/mode_test.dart b/sdk/lib/_internal/pub_generated/test/run/mode_test.dart
similarity index 73%
copy from sdk/lib/_internal/pub/test/run/mode_test.dart
copy to sdk/lib/_internal/pub_generated/test/run/mode_test.dart
index f6c60ff84c9c518bc400f3d57b4a0c1a89e5afd5..cff439fadd10d700fe073ca8ffd6cd8aca5e7279 100644
--- a/sdk/lib/_internal/pub/test/run/mode_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/run/mode_test.dart
@@ -29,16 +29,18 @@ main() {
   initConfig();
   withBarbackVersions("any", () {
     integration('runs a local script with customizable modes', () {
-      d.dir(appPath, [
-        d.pubspec({
+      d.dir(appPath, [d.pubspec({
           "name": "myapp",
           "transformers": ["myapp/src/transformer"]
         }),
-        d.dir("lib", [d.dir("src", [
-          d.file("transformer.dart", TRANSFORMER),
-          d.file("primary.in", "")
-        ])])
-      ]).create();
+            d.dir(
+                "lib",
+                [
+                    d.dir(
+                        "src",
+                        [
+                            d.file("transformer.dart", TRANSFORMER),
+                            d.file("primary.in", "")])])]).create();
 
       createLockFile('myapp', pkg: ['barback']);
 
@@ -54,19 +56,25 @@ main() {
     });
 
     integration('runs a dependency script with customizable modes', () {
-      d.dir("foo", [
-        d.pubspec({
+      d.dir("foo", [d.pubspec({
           "name": "foo",
           "version": "1.2.3",
           "transformers": ["foo/src/transformer"]
         }),
-        d.dir("lib", [d.dir("src", [
-          d.file("transformer.dart", TRANSFORMER),
-          d.file("primary.in", "")
-        ])])
-      ]).create();
-
-      d.appDir({"foo": {"path": "../foo"}}).create();
+            d.dir(
+                "lib",
+                [
+                    d.dir(
+                        "src",
+                        [
+                            d.file("transformer.dart", TRANSFORMER),
+                            d.file("primary.in", "")])])]).create();
+
+      d.appDir({
+        "foo": {
+          "path": "../foo"
+        }
+      }).create();
 
       createLockFile('myapp', sandbox: ['foo'], pkg: ['barback']);