[Sync] Removing duplicated includes between cc and h files.

components/sync/core_impl/sync_encryption_handler_impl.cc

 // Copyright 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/core_impl/sync_encryption_handler_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <queue>
-#include <string>
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/location.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
-#include "base/time/time.h"
 #include "base/tracked_objects.h"
-#include "components/sync/base/cryptographer.h"
 #include "components/sync/base/encryptor.h"
 #include "components/sync/base/experiments.h"
 #include "components/sync/base/passphrase_type.h"
 #include "components/sync/base/time.h"
 #include "components/sync/core/read_node.h"
 #include "components/sync/core/read_transaction.h"
 #include "components/sync/core/user_share.h"
 #include "components/sync/core/write_node.h"
 #include "components/sync/core/write_transaction.h"
 #include "components/sync/engine/sync_string_conversions.h"
@@ skipping 1629 matching lines @@
 base::Time SyncEncryptionHandlerImpl::GetExplicitPassphraseTime(
     PassphraseType passphrase_type) const {
   if (passphrase_type == PassphraseType::FROZEN_IMPLICIT_PASSPHRASE)
     return migration_time();
   else if (passphrase_type == PassphraseType::CUSTOM_PASSPHRASE)
     return custom_passphrase_time();
   return base::Time();
 }
 
 }  // namespace syncer