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

sdk/lib/_internal/pub_generated/test/global/binstubs/does_not_warn_if_on_path_test.dart

Index: sdk/lib/_internal/pub_generated/test/global/binstubs/does_not_warn_if_on_path_test.dart
diff --git a/sdk/lib/_internal/pub/test/global/binstubs/does_not_warn_if_on_path_test.dart b/sdk/lib/_internal/pub_generated/test/global/binstubs/does_not_warn_if_on_path_test.dart
similarity index 80%
copy from sdk/lib/_internal/pub/test/global/binstubs/does_not_warn_if_on_path_test.dart
copy to sdk/lib/_internal/pub_generated/test/global/binstubs/does_not_warn_if_on_path_test.dart
index 124d1679bd4fced8ab536167509c25a45bc70313..648519cfb3ab96f75332f446c9969d73d02ae55c 100644
--- a/sdk/lib/_internal/pub/test/global/binstubs/does_not_warn_if_on_path_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/global/binstubs/does_not_warn_if_on_path_test.dart
@@ -18,11 +18,9 @@ main() {
         "executables": {
           "script": null
         }
-      }, contents: [
-        d.dir("bin", [
-          d.file("script.dart", "main(args) => print('ok \$args');")
-        ])
-      ]);
+      },
+          contents: [
+              d.dir("bin", [d.file("script.dart", "main(args) => print('ok \$args');")])]);
     });
 
     // Add the test's cache bin directory to the path.
@@ -30,8 +28,11 @@ main() {
     var separator = Platform.operatingSystem == "windows" ? ";" : ":";
     var path = "${Platform.environment["PATH"]}$separator$binDir";
 
-    schedulePub(args: ["global", "activate", "foo"],
+    schedulePub(
+        args: ["global", "activate", "foo"],
         output: isNot(contains("is not on your path")),
-        environment: {"PATH": path});
+        environment: {
+      "PATH": path
+    });
   });
-}
+}