Revert of [Sync] IWYU cleanup.

components/sync/engine/cycle/sync_cycle_snapshot_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/engine/cycle/sync_cycle_snapshot.h"
 
+#include <memory>
+
 #include "base/test/values_test_util.h"
 #include "base/values.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace syncer {
 namespace {
 
 using base::ExpectDictBooleanValue;
 using base::ExpectDictDictionaryValue;
 using base::ExpectDictIntegerValue;
@@ skipping 53 matching lines @@
   ExpectDictIntegerValue(kNumEncryptionConflicts, *value,
                          "numEncryptionConflicts");
   ExpectDictIntegerValue(kNumHierarchyConflicts, *value,
                          "numHierarchyConflicts");
   ExpectDictIntegerValue(kNumServerConflicts, *value, "numServerConflicts");
   ExpectDictBooleanValue(false, *value, "notificationsEnabled");
 }
 
 }  // namespace
 }  // namespace syncer