Suppress line splitter test on Chrome/FF on Windows

tests/lib/lib.status

Index: tests/lib/lib.status
diff --git a/tests/lib/lib.status b/tests/lib/lib.status
index b4f44651b80ff880a1085d872712bd8ed1775814..8863e4ca006c1d29299599968bf281792e4b8806 100644
--- a/tests/lib/lib.status
+++ b/tests/lib/lib.status
@@ -344,3 +344,9 @@ mirrors/library_enumeration_deferred_loading_test: RuntimeError # L.loadLibrary
 mirrors/symbol_validation_test/none: RuntimeError # Please triage this failure.
 mirrors/typedef_deferred_library_test: RuntimeError # G.loadLibrary is not a function
 typed_data/typed_data_list_test: RuntimeError # this.get$length is not a function
+
+[ $compiler == dart2js && $system == windows && $runtime == chrome ]
+convert/line_splitter_test: RuntimeError
+
+[ $compiler == dart2js && $system == windows && $runtime == ff ]
+convert/line_splitter_test: RuntimeError