Fix 'Unused local variable' hints in analyzer and analysis_server.

pkg/analysis_server/test/services/refactoring/move_file_test.dart

Index: pkg/analysis_server/test/services/refactoring/move_file_test.dart
diff --git a/pkg/analysis_server/test/services/refactoring/move_file_test.dart b/pkg/analysis_server/test/services/refactoring/move_file_test.dart
index e07b85e25b61690cb94f8cb3b5abbefbe062cfb9..6c6d53bc95ef0ad85b37eda652d7c1c10f1facef 100644
--- a/pkg/analysis_server/test/services/refactoring/move_file_test.dart
+++ b/pkg/analysis_server/test/services/refactoring/move_file_test.dart
@@ -105,7 +105,7 @@ import '22/new_name.dart';
   test_importedLibrary_package() {
     // configure packages
     testFile = '/packages/my_pkg/aaa/test.dart';
-    File testFileRes = provider.newFile(testFile, '');
+    provider.newFile(testFile, '');
     Map<String, List<Folder>> packageMap = {
       'my_pkg': [provider.getResource('/packages/my_pkg')]
     };