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

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

Index: sdk/lib/_internal/pub_generated/lib/src/validator.dart
diff --git a/sdk/lib/_internal/pub/lib/src/validator.dart b/sdk/lib/_internal/pub_generated/lib/src/validator.dart
similarity index 75%
copy from sdk/lib/_internal/pub/lib/src/validator.dart
copy to sdk/lib/_internal/pub_generated/lib/src/validator.dart
index 7bdcdc999aacc3fda50304faca0c77be80ca3d3d..25e68435d3ba396519f991cf62f01fe9e55bc848 100644
--- a/sdk/lib/_internal/pub/lib/src/validator.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/validator.dart
@@ -55,30 +55,27 @@ abstract class Validator {
   /// [packageSize], if passed, should complete to the size of the tarred
   /// package, in bytes. This is used to validate that it's not too big to
   /// upload to the server.
-  static Future<Pair<List<String>, List<String>>> runAll(
-      Entrypoint entrypoint, [Future<int> packageSize]) {
+  static Future<Pair<List<String>, List<String>>> runAll(Entrypoint entrypoint,
+      [Future<int> packageSize]) {
     var validators = [
-      new LicenseValidator(entrypoint),
-      new NameValidator(entrypoint),
-      new PubspecFieldValidator(entrypoint),
-      new DependencyValidator(entrypoint),
-      new DependencyOverrideValidator(entrypoint),
-      new DirectoryValidator(entrypoint),
-      new ExecutableValidator(entrypoint),
-      new CompiledDartdocValidator(entrypoint),
-      new Utf8ReadmeValidator(entrypoint),
-      new SdkConstraintValidator(entrypoint)
-    ];
+        new LicenseValidator(entrypoint),
+        new NameValidator(entrypoint),
+        new PubspecFieldValidator(entrypoint),
+        new DependencyValidator(entrypoint),
+        new DependencyOverrideValidator(entrypoint),
+        new DirectoryValidator(entrypoint),
+        new ExecutableValidator(entrypoint),
+        new CompiledDartdocValidator(entrypoint),
+        new Utf8ReadmeValidator(entrypoint),
+        new SdkConstraintValidator(entrypoint)];
     if (packageSize != null) {
       validators.add(new SizeValidator(entrypoint, packageSize));
     }
 
-    return Future.wait(validators.map((validator) => validator.validate()))
-      .then((_) {
-      var errors =
-          flatten(validators.map((validator) => validator.errors));
-      var warnings =
-          flatten(validators.map((validator) => validator.warnings));
+    return Future.wait(
+        validators.map((validator) => validator.validate())).then((_) {
+      var errors = flatten(validators.map((validator) => validator.errors));
+      var warnings = flatten(validators.map((validator) => validator.warnings));
 
       if (!errors.isEmpty) {
         log.error("Missing requirements:");