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

sdk/lib/_internal/pub_generated/test/real_version_test.dart

Index: sdk/lib/_internal/pub_generated/test/real_version_test.dart
diff --git a/sdk/lib/_internal/pub/test/real_version_test.dart b/sdk/lib/_internal/pub_generated/test/real_version_test.dart
similarity index 95%
copy from sdk/lib/_internal/pub/test/real_version_test.dart
copy to sdk/lib/_internal/pub_generated/test/real_version_test.dart
index 97138087de49fe4b209f9b55f545314187429aa6..f9a60748eb06e649c2f1729916fd0970524d2a1c 100644
--- a/sdk/lib/_internal/pub/test/real_version_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/real_version_test.dart
@@ -29,7 +29,9 @@ main() {
   // the built SDK directory, and not the live pub code directly in the repo.
   integration('parse the real SDK "version" file', () {
     // Get the path to the pub binary in the SDK.
-    var pubPath = path.join(sdk.rootDirectory, 'bin',
+    var pubPath = path.join(
+        sdk.rootDirectory,
+        'bin',
         Platform.operatingSystem == "windows" ? "pub.bat" : "pub");
 
     var pub = new ScheduledProcess.start(pubPath, ['version']);