Remove unnecessary test size.

PiperOrigin-RevId: 552590422

domain_tests/BUILD

diff --git a/domain_tests/BUILD b/domain_tests/BUILD
index 399a121..4e24aa6 100644
--- a/domain_tests/BUILD
+++ b/domain_tests/BUILD
@@ -57,7 +57,6 @@
 
 cc_test(
     name = "arbitrary_domains_test",
-    size = "small",
     srcs = ["arbitrary_domains_test.cc"],
     deps = [
         ":domain_testing",