Add test and fix for 9203, fix sdk dep, delete unused file.

pkg/pkg.status

Index: pkg/pkg.status
diff --git a/pkg/pkg.status b/pkg/pkg.status
index a09acef5ecce6f84ddf24aa5152647de103e2cad..babbf22875147cd4ada252408394801831830f39 100644
--- a/pkg/pkg.status
+++ b/pkg/pkg.status
@@ -80,7 +80,8 @@ intl/test/date_time_format_http_request_test: Skip
 [ $compiler == dart2js ]
 # Skip intl_message tests that use mirrors on dart2js until it's been
 # implemented there.
-serialization/test/serialization_test: Skip
+serialization/test/serialization_test: Skip # Issue 6490
+serialization/test/no_library_test: Skip # Issue 6490
 analyzer_experimental/test/generated/ast_test: Skip
 analyzer_experimental/test/generated/element_test: Skip
 analyzer_experimental/test/generated/parser_test: Skip