Update from chromium https://crrev.com/302282

net/cert/x509_certificate_nss.cc

Index: net/cert/x509_certificate_nss.cc
diff --git a/net/cert/x509_certificate_nss.cc b/net/cert/x509_certificate_nss.cc
index a57f9ce71f200914bb7a597be57ac70073d410c3..45dd0a2743bc21e5f522ceea17657553fe836920 100644
--- a/net/cert/x509_certificate_nss.cc
+++ b/net/cert/x509_certificate_nss.cc
@@ -281,4 +281,13 @@ void X509Certificate::GetPublicKeyInfo(OSCertHandle cert_handle,
   x509_util::GetPublicKeyInfo(cert_handle, size_bits, type);
 }
 
+// static
+bool X509Certificate::IsSelfSigned(OSCertHandle cert_handle) {
+  crypto::ScopedSECKEYPublicKey public_key(CERT_ExtractPublicKey(cert_handle));
+  if (!public_key.get())
+    return false;
+  return SECSuccess == CERT_VerifySignedDataWithPublicKey(
+      &cert_handle->signatureWrap, public_key.get(), NULL);
+}
+
 }  // namespace net