Add "service_2" to CFE's list of opted out directories.

Change-Id: Ic63216b195e620e6f5d1955e37370b49efc30f17
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/167920
Auto-Submit: Bob Nystrom <rnystrom@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
diff --git a/pkg/front_end/lib/src/fasta/source/source_library_builder.dart b/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
index b34e638..a6fe7e9 100644
--- a/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
@@ -479,6 +479,7 @@
     'ffi_2',
     'language_2/',
     'lib_2/',
+    'service_2/',
     'standalone_2/',
     'vm/dart_2/', // in runtime/tests
   ];