Fix remaining incompatibilities between scoped_ptr and unique_ptr.

net/cert/ct_objects_extractor_openssl.cc

Index: net/cert/ct_objects_extractor_openssl.cc
diff --git a/net/cert/ct_objects_extractor_openssl.cc b/net/cert/ct_objects_extractor_openssl.cc
index 6fcc3b8e93b512830f48420922c3460a14333d57..7c878d3a8aacc618582f304d489fcff02874bed0 100644
--- a/net/cert/ct_objects_extractor_openssl.cc
+++ b/net/cert/ct_objects_extractor_openssl.cc
@@ -232,7 +232,7 @@ bool GetPrecertLogEntry(X509Certificate::OSCertHandle leaf,
   // Extract the issuer's public key.
   std::string issuer_der;
   if (!X509Certificate::GetDEREncoded(issuer, &issuer_der))
-    return ScopedX509();
+    return false;
   base::StringPiece issuer_key;
   if (!asn1::ExtractSPKIFromDERCert(issuer_der, &issuer_key))
     return false;