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

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

Index: sdk/lib/_internal/pub_generated/lib/src/validator/pubspec_field.dart
diff --git a/sdk/lib/_internal/pub/lib/src/validator/pubspec_field.dart b/sdk/lib/_internal/pub_generated/lib/src/validator/pubspec_field.dart
similarity index 74%
copy from sdk/lib/_internal/pub/lib/src/validator/pubspec_field.dart
copy to sdk/lib/_internal/pub_generated/lib/src/validator/pubspec_field.dart
index 546eb26c7e5b26954b109ab77a890984756f3eaa..d0f55b70cd3f57c6cada926336b878d6a4155ab3 100644
--- a/sdk/lib/_internal/pub/lib/src/validator/pubspec_field.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/validator/pubspec_field.dart
@@ -13,7 +13,7 @@ import '../validator.dart';
 /// fields.
 class PubspecFieldValidator extends Validator {
   PubspecFieldValidator(Entrypoint entrypoint)
-    : super(entrypoint);
+      : super(entrypoint);
 
   Future validate() {
     _validateAuthors();
@@ -47,15 +47,17 @@ class PubspecFieldValidator extends Validator {
     }
 
     if (author != null && author is! String) {
-      errors.add('Your pubspec.yaml\'s "author" field must be a string, but it '
-          'was "$author".');
+      errors.add(
+          'Your pubspec.yaml\'s "author" field must be a string, but it '
+              'was "$author".');
       return;
     }
 
     if (authors != null &&
         (authors is! List || authors.any((author) => author is! String))) {
-      errors.add('Your pubspec.yaml\'s "authors" field must be a list, but '
-          'it was "$authors".');
+      errors.add(
+          'Your pubspec.yaml\'s "authors" field must be a list, but '
+              'it was "$authors".');
       return;
     }
 
@@ -65,12 +67,13 @@ class PubspecFieldValidator extends Validator {
     var hasEmail = new RegExp(r"<[^>]+> *$");
     for (var authorName in authors) {
       if (!hasName.hasMatch(authorName)) {
-        warnings.add('Author "$authorName" in pubspec.yaml should have a '
-            'name.');
+        warnings.add(
+            'Author "$authorName" in pubspec.yaml should have a ' 'name.');
       }
       if (!hasEmail.hasMatch(authorName)) {
-        warnings.add('Author "$authorName" in pubspec.yaml should have an '
-            'email address\n(e.g. "name <email>").');
+        warnings.add(
+            'Author "$authorName" in pubspec.yaml should have an '
+                'email address\n(e.g. "name <email>").');
       }
     }
   }
@@ -81,8 +84,9 @@ class PubspecFieldValidator extends Validator {
     if (value == null) {
       errors.add('Your pubspec.yaml is missing a "$field" field.');
     } else if (value is! String) {
-      errors.add('Your pubspec.yaml\'s "$field" field must be a string, but '
-          'it was "$value".');
+      errors.add(
+          'Your pubspec.yaml\'s "$field" field must be a string, but '
+              'it was "$value".');
     }
   }
 
@@ -92,15 +96,16 @@ class PubspecFieldValidator extends Validator {
     if (url == null) return;
 
     if (url is! String) {
-      errors.add('Your pubspec.yaml\'s "$field" field must be a string, but '
-          'it was "$url".');
+      errors.add(
+          'Your pubspec.yaml\'s "$field" field must be a string, but ' 'it was "$url".');
       return;
     }
 
     var goodScheme = new RegExp(r'^https?:');
     if (!goodScheme.hasMatch(url)) {
-      errors.add('Your pubspec.yaml\'s "$field" field must be an "http:" or '
-          '"https:" URL, but it was "$url".');
+      errors.add(
+          'Your pubspec.yaml\'s "$field" field must be an "http:" or '
+              '"https:" URL, but it was "$url".');
     }
   }
 }