Add a key purpose parameter to Certificate PathBuilder.

net/cert/internal/path_builder_verify_certificate_chain_unittest.cc

Index: net/cert/internal/path_builder_verify_certificate_chain_unittest.cc
diff --git a/net/cert/internal/path_builder_verify_certificate_chain_unittest.cc b/net/cert/internal/path_builder_verify_certificate_chain_unittest.cc
index 3c404bed4b014c824c881c228701a4b8666d8884..43ba879a971987274d56fedf2589d42e651e6940 100644
--- a/net/cert/internal/path_builder_verify_certificate_chain_unittest.cc
+++ b/net/cert/internal/path_builder_verify_certificate_chain_unittest.cc
@@ -30,7 +30,8 @@ class PathBuilderDelegate {
     CertPathBuilder::Result result;
     // First cert in the |chain| is the target.
     CertPathBuilder path_builder(test.chain.front(), &trust_store,
-                                 &signature_policy, test.time, &result);
+                                 &signature_policy, test.time, test.key_purpose,
+                                 &result);
     path_builder.AddCertIssuerSource(&intermediate_cert_issuer_source);
 
     path_builder.Run();