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

sdk/lib/_internal/pub_generated/lib/src/validator/license.dart

Index: sdk/lib/_internal/pub_generated/lib/src/validator/license.dart
diff --git a/sdk/lib/_internal/pub/lib/src/validator/license.dart b/sdk/lib/_internal/pub_generated/lib/src/validator/license.dart
similarity index 68%
copy from sdk/lib/_internal/pub/lib/src/validator/license.dart
copy to sdk/lib/_internal/pub_generated/lib/src/validator/license.dart
index 46ca112cb76ed1a628f9b753245cf2c632bbbf15..944b58752b3a0678bf5e975c00b0fd8c53142991 100644
--- a/sdk/lib/_internal/pub/lib/src/validator/license.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/validator/license.dart
@@ -15,22 +15,20 @@ import '../validator.dart';
 /// A validator that checks that a LICENSE-like file exists.
 class LicenseValidator extends Validator {
   LicenseValidator(Entrypoint entrypoint)
-    : super(entrypoint);
+      : super(entrypoint);
 
   Future validate() {
     return new Future.sync(() {
-      var licenseLike = new RegExp(
-          r"^([a-zA-Z0-9]+[-_])?(LICENSE|COPYING)(\..*)?$");
-      if (entrypoint.root.listFiles(recursive: false)
-          .map(path.basename)
-          .any(licenseLike.hasMatch)) {
+      var licenseLike =
+          new RegExp(r"^([a-zA-Z0-9]+[-_])?(LICENSE|COPYING)(\..*)?$");
+      if (entrypoint.root.listFiles(
+          recursive: false).map(path.basename).any(licenseLike.hasMatch)) {
         return;
       }
 
       errors.add(
           "You must have a COPYING or LICENSE file in the root directory.\n"
-          "An open-source license helps ensure people can legally use your "
-          "code.");
+              "An open-source license helps ensure people can legally use your " "code.");
     });
   }
 }