Repeats and fixes the changes landed & reverted as CL 1789553003.

pkg/compiler/lib/src/parser/partial_parser.dart

Index: pkg/compiler/lib/src/parser/partial_parser.dart
diff --git a/pkg/compiler/lib/src/parser/partial_parser.dart b/pkg/compiler/lib/src/parser/partial_parser.dart
index 1c7722f881d7c82c9baf3f9101a8b717169a071e..355ddd8cc7066b458dfed967303c739a430073e2 100644
--- a/pkg/compiler/lib/src/parser/partial_parser.dart
+++ b/pkg/compiler/lib/src/parser/partial_parser.dart
@@ -5,6 +5,8 @@
 library dart2js.parser.partial;
 
 import '../common.dart';
+import '../options.dart' show
+    ParserOptions;
 import '../util/characters.dart' as Characters show
     $CLOSE_CURLY_BRACKET;
 import '../tokens/token.dart' show
@@ -20,9 +22,8 @@ import 'parser.dart' show
     Parser;
 
 class PartialParser extends Parser {
-  PartialParser(Listener listener, {bool enableConditionalDirectives})
-      : super(listener,
-          enableConditionalDirectives: enableConditionalDirectives);
+  PartialParser(Listener listener, ParserOptions options)
+      : super(listener, options);
 
   Token parseClassBody(Token token) => skipClassBody(token);