Use precompiled dependencies in pub.

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

Index: sdk/lib/_internal/pub/lib/src/validator.dart
diff --git a/sdk/lib/_internal/pub/lib/src/validator.dart b/sdk/lib/_internal/pub/lib/src/validator.dart
index 32194fec7ee0a98536167a83517eeba5d9240092..17e4645896c0bb0d91c1cbd47e97d0e8f3c3f022 100644
--- a/sdk/lib/_internal/pub/lib/src/validator.dart
+++ b/sdk/lib/_internal/pub/lib/src/validator.dart
@@ -13,6 +13,7 @@ import 'validator/compiled_dartdoc.dart';
 import 'validator/dependency.dart';
 import 'validator/dependency_override.dart';
 import 'validator/directory.dart';
+import 'validator/executable.dart';
 import 'validator/license.dart';
 import 'validator/name.dart';
 import 'validator/pubspec_field.dart';
@@ -62,6 +63,7 @@ abstract class Validator {
       new DependencyValidator(entrypoint),
       new DependencyOverrideValidator(entrypoint),
       new DirectoryValidator(entrypoint),
+      new ExecutableValidator(entrypoint),
       new CompiledDartdocValidator(entrypoint),
       new Utf8ReadmeValidator(entrypoint)
     ];