Add a key purpose parameter to Certificate PathBuilder.

net/cert/cert_verify_proc_builtin.cc

Index: net/cert/cert_verify_proc_builtin.cc
diff --git a/net/cert/cert_verify_proc_builtin.cc b/net/cert/cert_verify_proc_builtin.cc
index 12b82a4e2dfae29c379a4f0c6ef22a8bedd89493..3790b534e61956bb15cc2339c9f89f12980743b0 100644
--- a/net/cert/cert_verify_proc_builtin.cc
+++ b/net/cert/cert_verify_proc_builtin.cc
@@ -359,7 +359,8 @@ void DoVerify(X509Certificate* input_cert,
   // Initialize the path builder.
   CertPathBuilder::Result result;
   CertPathBuilder path_builder(target, trust_store->GetTrustStore(),
-                               &signature_policy, verification_time, &result);
+                               &signature_policy, verification_time,
+                               KeyPurpose::KEY_PURPOSE_SERVER_AUTH, &result);
 
   // Allow the path builder to discover intermediates from the trust store.
   if (trust_store->GetCertIssuerSource())