Stop working around issue 2980.

sdk/lib/_internal/pub/test/command_line_config.dart

Index: sdk/lib/_internal/pub/test/command_line_config.dart
diff --git a/sdk/lib/_internal/pub/test/command_line_config.dart b/sdk/lib/_internal/pub/test/command_line_config.dart
index ed55aff16ff4eefe459e1dd10240f9703a9432d1..bdceafb80ba6e21702d434f9514943c64c117b66 100644
--- a/sdk/lib/_internal/pub/test/command_line_config.dart
+++ b/sdk/lib/_internal/pub/test/command_line_config.dart
@@ -106,11 +106,8 @@ class CommandLineConfiguration extends Configuration {
     return result.toString();
   }
 
-  String _indent(String str) {
-    // TODO(nweiz): Use this simpler code once issue 2980 is fixed.
-    // return str.replaceAll(new RegExp("^", multiLine: true), "  ");
-    return str.split("\n").map((line) => "  $line").join("\n");
-  }
+  String _indent(String str) =>
+    str.replaceAll(new RegExp("^", multiLine: true), "  ");
 }
 
 class _StackFrame {