Roll back "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 97c120a3e08d95fac6afa97562900735590516e5..64b2021a627c0178e39a403f79b20e0fccbf82fb 100644
--- a/pkg/unittest/lib/compact_vm_config.dart
+++ b/pkg/unittest/lib/compact_vm_config.dart
@@ -15,7 +15,6 @@ import 'dart:io';
 import 'dart:isolate';
 
 import 'unittest.dart';
-import 'src/utils.dart';
 import 'vm_config.dart';
 
 const String _GREEN = '\u001b[32m';
@@ -58,11 +57,11 @@ 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) {
-        print(indent(test.stackTrace.toString()));
+      if (test.stackTrace != null && test.stackTrace != '') {
+        print(_indent(test.stackTrace));
       }
     }
   }
@@ -76,6 +75,10 @@ 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;