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

chrome/browser/chromeos/login/easy_unlock/easy_unlock_get_keys_operation.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 "chrome/browser/chromeos/login/easy_unlock/easy_unlock_get_keys_operation.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 14 matching lines @@
 EasyUnlockGetKeysOperation::~EasyUnlockGetKeysOperation() {
 }
 
 void EasyUnlockGetKeysOperation::Start() {
   // TODO(xiyuan): Use ListKeyEx.
   key_index_ = 0;
   GetKeyData();
 }
 
 void EasyUnlockGetKeysOperation::GetKeyData() {
-  std::string canonicalized =
-      gaia::CanonicalizeEmail(user_context_.GetUserID());
-  cryptohome::Identification id(canonicalized);
+  user_manager::UserID user_id(user_context_.GetUserID());
+  user_id.SetUserEmail(gaia::CanonicalizeEmail(user_id.GetUserEmail()));
+  cryptohome::Identification id(user_id);
   cryptohome::HomedirMethods::GetInstance()->GetKeyDataEx(
       id,
       EasyUnlockKeyManager::GetKeyLabel(key_index_),
       base::Bind(&EasyUnlockGetKeysOperation::OnGetKeyData,
                  weak_ptr_factory_.GetWeakPtr()));
 
 }
 
 void EasyUnlockGetKeysOperation::OnGetKeyData(
     bool success,
@@ skipping 51 matching lines @@
                    << entry.name;
     }
   }
   devices_.push_back(device);
 
   ++key_index_;
   GetKeyData();
 }
 
 }  // namespace chromeos