Add path validation error expectations for PKITS tests.

net/cert/internal/verify_certificate_chain_unittest.cc

Index: net/cert/internal/verify_certificate_chain_unittest.cc
diff --git a/net/cert/internal/verify_certificate_chain_unittest.cc b/net/cert/internal/verify_certificate_chain_unittest.cc
index 82851d034a80cfe05237ad96931f5554c6009030..9b1e3e898a665c4a4354375976588bbf6545aadc 100644
--- a/net/cert/internal/verify_certificate_chain_unittest.cc
+++ b/net/cert/internal/verify_certificate_chain_unittest.cc
@@ -5,6 +5,7 @@
 #include "net/cert/internal/verify_certificate_chain.h"
 
 #include "net/cert/internal/signature_policy.h"
+#include "net/cert/internal/test_helpers.h"
 #include "net/cert/internal/trust_store.h"
 #include "net/cert/internal/verify_certificate_chain_typed_unittest.h"
 
@@ -26,8 +27,8 @@ class VerifyCertificateChainDelegate {
         test.user_initial_policy_set, test.initial_policy_mapping_inhibit,
         test.initial_any_policy_inhibit,
         nullptr /*user_constrained_policy_set*/, &errors);
-    EXPECT_EQ(test.expected_errors, errors.ToDebugString(test.chain))
-        << "Test file: " << test_file_path;
+    VerifyCertPathErrors(test.expected_errors, errors, test.chain,
+                         test_file_path);
   }
 };