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

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

Index: sdk/lib/_internal/pub_generated/test/cache/add/bad_version_test.dart
diff --git a/sdk/lib/_internal/pub/test/cache/add/bad_version_test.dart b/sdk/lib/_internal/pub_generated/test/cache/add/bad_version_test.dart
similarity index 87%
copy from sdk/lib/_internal/pub/test/cache/add/bad_version_test.dart
copy to sdk/lib/_internal/pub_generated/test/cache/add/bad_version_test.dart
index c0df5aa9d831e77755b80a305ed8ed4a07bfd0cb..322aefec5e9dc79795b2dde4d7825339b1834cc3 100644
--- a/sdk/lib/_internal/pub/test/cache/add/bad_version_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/cache/add/bad_version_test.dart
@@ -10,8 +10,7 @@ import '../../test_pub.dart';
 main() {
   initConfig();
   integration('fails if the version constraint cannot be parsed', () {
-    schedulePub(args: ["cache", "add", "foo", "-v", "1.0"],
-        error: """
+    schedulePub(args: ["cache", "add", "foo", "-v", "1.0"], error: """
             Could not parse version "1.0". Unknown text at "1.0".
             
             Usage: pub cache add <package> [--version <constraint>] [--all]
@@ -21,7 +20,6 @@ main() {
 
             Run "pub help" to see global options.
             See http://dartlang.org/tools/pub/cmd/pub-cache.html for detailed documentation.
-            """,
-        exitCode: exit_codes.USAGE);
+            """, exitCode: exit_codes.USAGE);
   });
 }