libwebservd: Use toString8 when logging binder::Status

BUG=28171901

Change-Id: I9af9b29cd0e76f6fbf31c0d1f0957c341ed83494

libwebserv/binder_server.cc

diff --git a/libwebserv/binder_server.cc b/libwebserv/binder_server.cc
index cd55804..3cce096 100644
--- a/libwebserv/binder_server.cc
+++ b/libwebserv/binder_server.cc
@@ -183,7 +183,7 @@
       Status status = handler->GetCertificateFingerprint(&result);
       if (!status.isOk()) {
         LOG(WARNING) << "Could not get certificate fingerprint "
-                     << "from protocol handler: " << status;
+                     << "from protocol handler: " << status.toString8();
       } else if (!result.empty()) {
         break;
       }