Fix some tests and exclude others from CRLF rewriting.

tests/lib/convert/json_pretty_test.dart

Index: tests/lib/convert/json_pretty_test.dart
diff --git a/tests/lib/convert/json_pretty_test.dart b/tests/lib/convert/json_pretty_test.dart
index a0c3bc61e350b185210429005dc31f85eb37c833..62380525aca53d9fb240278d45f6c52bb6015247 100644
--- a/tests/lib/convert/json_pretty_test.dart
+++ b/tests/lib/convert/json_pretty_test.dart
@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// Note: This test relies on LF line endings in the source file.
+
 library json_pretty_test;
 
 import 'dart:convert';