Roll forward "Use package:stack_trace in unittest."

pkg/unittest/lib/compact_vm_config.dart

Index: pkg/unittest/lib/compact_vm_config.dart
diff --git a/pkg/unittest/lib/compact_vm_config.dart b/pkg/unittest/lib/compact_vm_config.dart
index b2bbc59bad43a9f19ac83b7deeaf2b2d2375dc8c..3658ef46e604c3b96d6fa08cb70ad7b81c374edc 100644
--- a/pkg/unittest/lib/compact_vm_config.dart
+++ b/pkg/unittest/lib/compact_vm_config.dart
@@ -14,6 +14,7 @@ import 'dart:async';
 import 'dart:io';
 
 import 'unittest.dart';
+import 'src/utils.dart';
 import 'vm_config.dart';
 
 const String _GREEN = '\u001b[32m';
@@ -51,11 +52,11 @@ class CompactVMConfiguration extends VMConfiguration {
       _progressLine(_start, _pass, _fail, test.description);
       print('');
       if (test.message != '') {
-        print(_indent(test.message));
+        print(indent(test.message));
       }
 
-      if (test.stackTrace != null && test.stackTrace != '') {
-        print(_indent(test.stackTrace));
+      if (test.stackTrace != null) {
+        print(indent(test.stackTrace.toString()));
       }
     }
   }
@@ -68,10 +69,6 @@ class CompactVMConfiguration extends VMConfiguration {
     });
   }
 
-  String _indent(String str) {
-    return str.split("\n").map((line) => "  $line").join("\n");
-  }
-
   void onSummary(int passed, int failed, int errors, List<TestCase> results,
       String uncaughtError) {
     var success = false;