Fix some tests and exclude others from CRLF rewriting.

tests/lib/mirrors/method_mirror_source_line_ending_cr.dart

Index: tests/lib/mirrors/method_mirror_source_line_ending_cr.dart
diff --git a/tests/lib/mirrors/method_mirror_source_line_ending_cr.dart b/tests/lib/mirrors/method_mirror_source_line_ending_cr.dart
index 851c04cf86c6f2c9f84a57000029b235fa9a2761..45533d47348666dc277b42e6845aeb29615f0b0f 100755
--- a/tests/lib/mirrors/method_mirror_source_line_ending_cr.dart
+++ b/tests/lib/mirrors/method_mirror_source_line_ending_cr.dart
@@ -1 +1 @@
-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
// 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.
// This file is marked executable so source control will preserve the type of
// line ending.
library line_endings.cr;
oneLineCR(x) => x;
multiLineCR(y) {
  return y + 1;
}
b
(){
}
+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
// 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 CR line endings in the source file.
library line_endings.cr;
oneLineCR(x) => x;
multiLineCR(y) {
  return y + 1;
}
b
(){
}