Set return type of factory constructors properly.

pkg/front_end/lib/src/fasta/kernel/body_builder.dart

Index: pkg/front_end/lib/src/fasta/kernel/body_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
index bd03e5fe879fc96702b3fe122cdd1a1f17ae8e27..db00c358d2976b75826e10468100d10dc689d1e2 100644
--- a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
@@ -482,9 +482,6 @@ class BodyBuilder extends ScopeListener<JumpTarget> implements BuilderHelper {
 
   DartType _computeReturnTypeContext(MemberBuilder member) {
     if (member is KernelProcedureBuilder) {
-      if (member.target.kind == ProcedureKind.Factory) {
-        return computeFactoryConstructorReturnType(member.target);
-      }

[ahe, 2017/06/01 09:10:08]

I have to "steal" this :-)

       return member.target.function.returnType;
     } else {
       assert(member is KernelConstructorBuilder);