Fix some pub analyzer warnings.

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

Index: sdk/lib/_internal/pub/lib/src/cached_package.dart
diff --git a/sdk/lib/_internal/pub/lib/src/cached_package.dart b/sdk/lib/_internal/pub/lib/src/cached_package.dart
index 3dc2323689f05d2129d69dae573afdb05c1837a1..6fac594da38fefdbda99798dba0ce9d757b1612e 100644
--- a/sdk/lib/_internal/pub/lib/src/cached_package.dart
+++ b/sdk/lib/_internal/pub/lib/src/cached_package.dart
@@ -47,11 +47,15 @@ class CachedPackage extends Package {
 
   /// 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,