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

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

Index: sdk/lib/_internal/pub_generated/lib/src/validator/compiled_dartdoc.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/validator/compiled_dartdoc.dart b/sdk/lib/_internal/pub_generated/lib/src/validator/compiled_dartdoc.dart
deleted file mode 100644
index 99900d8916c94a1a5d0127dfcad72eba8bc8727e..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/lib/src/validator/compiled_dartdoc.dart
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library pub.validator.compiled_dartdoc;
-
-import 'dart:async';
-
-import 'package:path/path.dart' as path;
-
-import '../entrypoint.dart';
-import '../io.dart';
-import '../validator.dart';
-
-/// Validates that a package doesn't contain compiled Dartdoc
-/// output.
-class CompiledDartdocValidator extends Validator {
-  CompiledDartdocValidator(Entrypoint entrypoint)
-      : super(entrypoint);
-
-  Future validate() {
-    return new Future.sync(() {
-      for (var entry in entrypoint.root.listFiles(useGitIgnore: true)) {
-        if (path.basename(entry) != "nav.json") continue;
-        var dir = path.dirname(entry);
-
-        // Look for tell-tale Dartdoc output files all in the same directory.
-        var files = [
-            entry,
-            path.join(dir, "index.html"),
-            path.join(dir, "styles.css"),
-            path.join(dir, "dart-logo-small.png"),
-            path.join(dir, "client-live-nav.js")];
-
-        if (files.every((val) => fileExists(val))) {
-          warnings.add(
-              "Avoid putting generated documentation in " "${path.relative(dir)}.\n"
-                  "Generated documentation bloats the package with redundant " "data.");
-        }
-      }
-    });
-  }
-}