[Sync] Replace typedef with using.

components/sync/base/enum_set_unittest.cc

 // Copyright (c) 2012 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/sync/base/enum_set.h"
 
 #include <stddef.h>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace syncer {
 namespace {
 
 enum TestEnum {
   TEST_0,
   TEST_MIN = TEST_0,
   TEST_1,
   TEST_2,
   TEST_3,
   TEST_4,
   TEST_MAX = TEST_4,
   TEST_5
 };
 
-typedef EnumSet<TestEnum, TEST_MIN, TEST_MAX> TestEnumSet;
+using TestEnumSet = EnumSet<TestEnum, TEST_MIN, TEST_MAX>;
 
 class EnumSetTest : public ::testing::Test {};
 
 TEST_F(EnumSetTest, ClassConstants) {
   TestEnumSet enums;
   EXPECT_EQ(TEST_MIN, TestEnumSet::kMinValue);
   EXPECT_EQ(TEST_MAX, TestEnumSet::kMaxValue);
   EXPECT_EQ(static_cast<size_t>(5), TestEnumSet::kValueCount);
 }
 
@@ skipping 151 matching lines @@
 TEST_F(EnumSetTest, Difference) {
   const TestEnumSet enums1(TEST_3, TEST_4);
   const TestEnumSet enums2(TEST_2, TEST_3);
   const TestEnumSet enums3 = Difference(enums1, enums2);
 
   EXPECT_EQ(TestEnumSet(TEST_4), enums3);
 }
 
 }  // namespace
 }  // namespace syncer