Don't treat trust anchors as certificates during path building.

net/cert/internal/path_builder_pkits_unittest.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/cert/internal/path_builder.h"
 
 #include "net/base/net_errors.h"
 #include "net/cert/internal/cert_issuer_source_static.h"
 #include "net/cert/internal/parse_certificate.h"
 #include "net/cert/internal/parsed_certificate.h"
@@ skipping 49 matching lines @@
     for (const std::string& der : cert_ders) {
       certs.push_back(ParsedCertificate::CreateFromCertificateCopy(der, {}));
       if (!certs.back()) {
         ADD_FAILURE() << "ParsedCertificate::CreateFromCertificateCopy failed";
         return false;
       }
     }
     // First entry in the PKITS chain is the trust anchor.
     // TODO(mattm): test with all possible trust anchors in the trust store?
     TrustStore trust_store;
-    trust_store.AddTrustedCertificate(certs[0]);
+
+    scoped_refptr<TrustAnchor> trust_anchor =
+        TrustAnchor::CreateFromCertificateNoConstraints(certs[0]);
+    trust_store.AddTrustAnchor(std::move(trust_anchor));
 
     // TODO(mattm): test with other irrelevant certs in cert_issuer_sources?
     CertIssuerSourceStatic cert_issuer_source;
     for (size_t i = 1; i < cert_ders.size() - 1; ++i)
       cert_issuer_source.AddCert(certs[i]);
 
     scoped_refptr<ParsedCertificate> target_cert(certs.back());
 
     SimpleSignaturePolicy signature_policy(1024);
 
@@ skipping 137 matching lines @@
 
 // TODO(mattm): CRL support: PkitsTest04BasicCertificateRevocationTests,
 // PkitsTest05VerifyingPathswithSelfIssuedCertificates,
 // PkitsTest14DistributionPoints, PkitsTest15DeltaCRLs
 
 // TODO(mattm): Certificate Policies support: PkitsTest08CertificatePolicies,
 // PkitsTest09RequireExplicitPolicy PkitsTest10PolicyMappings,
 // PkitsTest11InhibitPolicyMapping, PkitsTest12InhibitAnyPolicy
 
 }  // namespace net