Parse factory constructors with Fasta.

pkg/front_end/lib/src/fasta/source/outline_builder.dart

Index: pkg/front_end/lib/src/fasta/source/outline_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/source/outline_builder.dart b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
index 5be03bde2ae562c4ea6271562da9202b52871ed4..a974a3820deb7bae4f4a8e57cc43862787aace8b 100644
--- a/pkg/front_end/lib/src/fasta/source/outline_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
@@ -600,7 +600,8 @@ class OutlineBuilder extends UnhandledListener {
   }
 
   @override
-  void endFactoryMethod(Token beginToken, Token endToken) {
+  void endFactoryMethod(
+      Token beginToken, Token factoryKeyword, Token endToken) {
     debugEvent("FactoryMethod");
     MethodBody kind = pop();
     ConstructorReferenceBuilder redirectionTarget;