Add again useVmConfiguration for deprecation purposes. This requires adding a

pkg/unittest/lib/vm_config.dart

Index: pkg/unittest/lib/vm_config.dart
diff --git a/pkg/unittest/lib/vm_config.dart b/pkg/unittest/lib/vm_config.dart
index 0b23996fea54dcb8ba58f4da17f974d41129a598..5682c0e1e1bebf2b8c9ee9b1a70c122cbfc2dd1f 100644
--- a/pkg/unittest/lib/vm_config.dart
+++ b/pkg/unittest/lib/vm_config.dart
@@ -9,6 +9,7 @@ library unittest_vm_config;
 
 import 'dart:io';
 import 'unittest.dart';
+import 'package:meta/meta.dart';
 
 class VMConfiguration extends Configuration {
   void onDone(bool success) {
@@ -27,3 +28,6 @@ class VMConfiguration extends Configuration {
 void useVMConfiguration() {
   configure(new VMConfiguration());
 }
+
+@deprecated
+void useVmConfiguration() => useVMConfiguration();