Fixing the build breakage from #29285 (#29399)

test/cpp/end2end/xds/xds_csds_end2end_test.cc

@@ -693,12 +693,12 @@ TEST_P(CsdsShortAdsTimeoutTest, XdsConfigDumpEndpointDoesNotExist) {
           ClientResourceStatus::DOES_NOT_EXIST, ::testing::_)));
 }
 
-#endif  // DISABLED_XDS_PROTO_IN_CC
-
 }  // namespace
 }  // namespace testing
 }  // namespace grpc
 
+#endif  // DISABLED_XDS_PROTO_IN_CC
+
 int main(int argc, char** argv) {
   grpc::testing::TestEnvironment env(&argc, argv);
   ::testing::InitGoogleTest(&argc, argv);