[NTP Snippets] Cleanups from clang-tidy

components/ntp_snippets/ntp_snippets_status_service_unittest.cc

 // Copyright 2016 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 "components/ntp_snippets/ntp_snippets_status_service.h"
 
 #include <memory>
 
 #include "components/ntp_snippets/ntp_snippets_test_utils.h"
 #include "components/ntp_snippets/pref_names.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/testing_pref_service.h"
 #include "components/signin/core/browser/account_tracker_service.h"
 #include "components/signin/core/browser/fake_signin_manager.h"
 #include "components/signin/core/browser/test_signin_client.h"
 #include "components/signin/core/common/signin_pref_names.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using testing::Return;
-
 namespace ntp_snippets {
 
 class NTPSnippetsStatusServiceTest : public ::testing::Test {
  public:
   NTPSnippetsStatusServiceTest() {
     NTPSnippetsStatusService::RegisterProfilePrefs(
         utils_.pref_service()->registry());
   }
 
   std::unique_ptr<NTPSnippetsStatusService> MakeService() {
@@ skipping 19 matching lines @@
   EXPECT_EQ(DisabledReason::EXPLICITLY_DISABLED,
             service->GetDisabledReasonFromDeps());
 
   // Signing-in shouldn't matter anymore.
   utils_.fake_signin_manager()->SignIn("foo@bar.com");
   EXPECT_EQ(DisabledReason::EXPLICITLY_DISABLED,
             service->GetDisabledReasonFromDeps());
 }
 
 }  // namespace ntp_snippets