update dartfmt

pkgs/pubspec_parse/test/ensure_build_test.dart

diff --git a/pkgs/pubspec_parse/test/ensure_build_test.dart b/pkgs/pubspec_parse/test/ensure_build_test.dart
index 2842c5a..854dd24 100644
--- a/pkgs/pubspec_parse/test/ensure_build_test.dart
+++ b/pkgs/pubspec_parse/test/ensure_build_test.dart
@@ -44,8 +44,7 @@
 Set<String> _changedGeneratedFiles() {
   var output = _runProc('git', ['status', '--porcelain']);
 
-  return LineSplitter
-      .split(output)
+  return LineSplitter.split(output)
       .map((line) => line.split(_whitespace).last)
       .where((path) => path.endsWith('.dart'))
       .toSet();