Compute correct return type for factory methods.

pkg/front_end/test/fasta/outline.status

Index: pkg/front_end/test/fasta/outline.status
diff --git a/pkg/front_end/test/fasta/outline.status b/pkg/front_end/test/fasta/outline.status
index c867746e0b3b7c09d9bd2659d7b0c88a5b4768ad..ae869ef93cc7be1d0024d72fc0c460441fcfe0a7 100644
--- a/pkg/front_end/test/fasta/outline.status
+++ b/pkg/front_end/test/fasta/outline.status
@@ -3,10 +3,7 @@
 # BSD-style license that can be found in the LICENSE.md file.
 
 function_type_recovery: Fail # Fixed in ahe's dev branch.
-inference/constructors_infer_from_arguments_redirecting_factory_to_factory: Fail # Fixed in ahe's dev branch.
 rasta/class_hierarchy: Fail # Fixed in ahe's dev branch.
-redirecting_constructor: Fail # Fixed in ahe's dev branch.
-redirecting_factory: Fail # Fixed in ahe's dev branch.
 
 inference/async_closure_return_type_flatten: Fail
 inference/async_closure_return_type_future: Fail
@@ -277,17 +274,12 @@ inference/unsafe_block_closure_inference_method_call_implicit_type_param: Fail
 inference/unsafe_block_closure_inference_method_call_no_type_param: Fail
 inference/void_return_type_subtypes_dynamic: Fail
 
-rasta/bad_redirection: Fail
 rasta/generic_factory: Fail
-rasta/issue_000002: Fail
 rasta/issue_000032: Fail
 rasta/issue_000044: Fail
 rasta/issue_000045: Fail
 rasta/issue_000046: Fail
 rasta/issue_000047: Fail
-rasta/issue_000067: Fail
-rasta/issue_000070: Fail
 rasta/mandatory_parameter_initializer: Fail
-rasta/native_is_illegal: Fail
 rasta/super_mixin: Fail
 rasta/type_with_parse_error: Fail