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

chrome/browser/policy/profile_policy_connector.cc

 // Copyright (c) 2013 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/policy/profile_policy_connector.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 92 matching lines @@
   if (!user) {
     DCHECK(schema_registry);
     // This case occurs for the signin profile.
     special_user_policy_provider_.reset(
         new LoginProfilePolicyProvider(connector->GetPolicyService()));
   } else {
     // |user| should never be NULL except for the signin profile.
     is_primary_user_ =
         user == user_manager::UserManager::Get()->GetPrimaryUser();
     special_user_policy_provider_ = DeviceLocalAccountPolicyProvider::Create(
-        user->email(),
+        user->GetUserID(),
         connector->GetDeviceLocalAccountPolicyService());
   }
   if (special_user_policy_provider_) {
     special_user_policy_provider_->Init(schema_registry);
     providers.push_back(special_user_policy_provider_.get());
   }
 #endif
 
   policy_service_.reset(new PolicyServiceImpl(providers));
 
@@ skipping 52 matching lines @@
   BrowserPolicyConnectorChromeOS* connector =
       g_browser_process->platform_part()->browser_policy_connector_chromeos();
   if (HasChromePolicy(connector->GetDeviceCloudPolicyManager(), name))
     return false;
 #endif
 
   return true;
 }
 
 }  // namespace policy