Fix some pub analyzer warnings.

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

 // Copyright (c) 2014, 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.cached_package;
 
 import 'package:path/path.dart' as p;
 import 'package:yaml/yaml.dart';
 
 import 'barback/transformer_config.dart';
@@ skipping 29 matching lines @@
     }
   }
 
   String relative(String path) {
     if (p.isWithin(path, _cacheDir)) return p.relative(path, from: _cacheDir);
     return super.relative(path);
   }
 
   /// This will include the cached, transformed versions of files if [beneath]
   /// is within a cached directory, but not otherwise.
-  List<String> listFiles({String beneath, recursive: true}) {
-    if (beneath == null) return super.listFiles(recursive: recursive);
+  List<String> listFiles({String beneath, recursive: true,
+      bool useGitIgnore: false}) {
+    if (beneath == null) {
+      return super.listFiles(recursive: recursive, useGitIgnore: useGitIgnore);
+    }
 
     if (_pathInCache(beneath)) return listDir(p.join(_cacheDir, beneath));
-    return super.listFiles(beneath: beneath, recursive: recursive);
+    return super.listFiles(beneath: beneath, recursive: recursive,
+        useGitIgnore: useGitIgnore);
   }
 
   /// Returns whether [relativePath], a path relative to the package's root,
   /// is in a cached directory.
   bool _pathInCache(String relativePath) => p.isWithin('lib', relativePath);
 }
 
 /// A pubspec wrapper that reports no transformers.
 class _CachedPubspec implements Pubspec {
   final Pubspec _inner;
 
   YamlMap get fields => _inner.fields;
   String get name => _inner.name;
   Version get version => _inner.version;
   List<PackageDep> get dependencies => _inner.dependencies;
   List<PackageDep> get devDependencies => _inner.devDependencies;
   List<PackageDep> get dependencyOverrides => _inner.dependencyOverrides;
   PubspecEnvironment get environment => _inner.environment;
   String get publishTo => _inner.publishTo;
   Map<String, String> get executables => _inner.executables;
   bool get isPrivate => _inner.isPrivate;
   bool get isEmpty => _inner.isEmpty;
   List<PubspecException> get allErrors => _inner.allErrors;
 
   List<Set<TransformerConfig>> get transformers => const [];
 
   _CachedPubspec(this._inner);
 }