Add optional context for certificate errors.

net/tools/cert_verify_tool/verify_using_path_builder.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/tools/cert_verify_tool/verify_using_path_builder.h"
 
 #include <iostream>
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 128 matching lines @@
     std::string trust_anchor_cert_fingerprint = "<no cert>";
     if (trust_anchor->cert()) {
       trust_anchor_cert_fingerprint =
           FingerPrintParsedCertificate(trust_anchor->cert().get());
     }
     std::cout << " " << trust_anchor_cert_fingerprint << " "
               << SubjectFromTrustAnchor(trust_anchor.get()) << "\n";
   }
 
   // Print the errors.
-  if (!result_path->errors.errors().empty()) {
+  if (!result_path->errors.empty()) {
     std::cout << "Errors:\n";
     std::cout << result_path->errors.ToDebugString() << "\n";
   }
 }
 
 }  // namespace
 
 // Verifies |target_der_cert| using CertPathBuilder.
 bool VerifyUsingPathBuilder(
     const CertInput& target_der_cert,
@@ skipping 100 matching lines @@
     if (!DumpParsedCertificateChain(
             dump_prefix_path.AddExtension(
                 FILE_PATH_LITERAL(".CertPathBuilder.pem")),
             result.paths[result.best_result_index]->path)) {
       return false;
     }
   }
 
   return result.HasValidPath();
 }