Stop working around issue 2980.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//16584002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@23715 260f80e4-7a28-3924-810f-c04153c831b5

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 {