Use a TestBrowserThreadBundle in the DeviceSettingsTestBase.

chrome/browser/chromeos/policy/cloud_external_data_policy_observer_unittest.cc

 // Copyright 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/chromeos/policy/cloud_external_data_policy_observer.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/file_util.h"
@@ skipping 159 matching lines @@
 
 CloudExternalDataPolicyObserverTest::~CloudExternalDataPolicyObserverTest() {
 }
 
 void CloudExternalDataPolicyObserverTest::SetUp() {
   chromeos::DeviceSettingsTestBase::SetUp();
   device_local_account_policy_service_.reset(
       new DeviceLocalAccountPolicyService(&device_settings_test_helper_,
                                           &device_settings_service_,
                                           &cros_settings_,
-                                          loop_.message_loop_proxy(),
-                                          loop_.message_loop_proxy(),
-                                          loop_.message_loop_proxy(),
-                                          loop_.message_loop_proxy(),
+                                          base::MessageLoopProxy::current(),
+                                          base::MessageLoopProxy::current(),
+                                          base::MessageLoopProxy::current(),
+                                          base::MessageLoopProxy::current(),
                                           NULL));
   url_fetcher_factory_.set_remove_fetcher_on_delete(true);
 
   EXPECT_CALL(user_policy_provider_, IsInitializationComplete(_))
       .WillRepeatedly(Return(true));
   user_policy_provider_.Init();
 
   ConstructAvatarPolicy("avatar1.jpg",
                         kAvatar1URL,
                         &avatar_policy_1_data_,
@@ skipping 742 matching lines @@
 
   EXPECT_TRUE(set_calls_.empty());
   EXPECT_TRUE(cleared_calls_.empty());
   ASSERT_EQ(1u, fetched_calls_.size());
   EXPECT_EQ(kRegularUserID, fetched_calls_.front().first);
   EXPECT_EQ(avatar_policy_2_data_, fetched_calls_.front().second);
   ClearObservations();
 }
 
 }  // namespace policy