We should use UserID object to identify users instead of username.

chromeos/cryptohome/homedir_methods.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromeos/cryptohome/homedir_methods.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "chromeos/dbus/cryptohome/key.pb.h"
 #include "chromeos/dbus/cryptohome/rpc.pb.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
+#include "google_apis/gaia/gaia_auth_util.h"
 
 #if defined(USE_SYSTEM_PROTOBUF)
 #include <google/protobuf/repeated_field.h>
 #else
 #include "third_party/protobuf/src/google/protobuf/repeated_field.h"
 #endif
 
 using chromeos::DBusThreadManager;
 using google::protobuf::RepeatedPtrField;
 
@@ skipping 64 matching lines @@
     if (it->number)
       entry->set_number(*it->number);
     if (it->bytes)
       entry->set_bytes(*it->bytes);
   }
 }
 
 // Fill identification protobuffer.
 void FillIdentificationProtobuf(const Identification& id,
                                 cryptohome::AccountIdentifier* id_proto) {
-  id_proto->set_email(id.user_id);
+  id_proto->set_email(gaia::CanonicalizeEmail(id.user_id.GetUserEmail()));
 }
 
 // Fill authorization protobuffer.
 void FillAuthorizationProtobuf(const Authorization& auth,
                                cryptohome::AuthorizationRequest* auth_proto) {
   Key* key = auth_proto->mutable_key();
   if (!auth.label.empty()) {
     key->mutable_data()->set_label(auth.label);
   }
   key->set_secret(auth.key);
@@ skipping 373 matching lines @@
   }
   delete g_homedir_methods;
   g_homedir_methods = NULL;
   VLOG(1) << "HomedirMethods Shutdown completed";
 }
 
 // static
 HomedirMethods* HomedirMethods::GetInstance() { return g_homedir_methods; }
 
 }  // namespace cryptohome