[Sync] Move the last things out of core/.

components/sync/core/sync_manager.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/core/sync_manager.h"
-
-namespace syncer {
-
-SyncCredentials::SyncCredentials() {}
-
-SyncCredentials::SyncCredentials(const SyncCredentials& other) = default;
-
-SyncCredentials::~SyncCredentials() {}
-
-SyncManager::ChangeDelegate::~ChangeDelegate() {}
-
-SyncManager::ChangeObserver::~ChangeObserver() {}
-
-SyncManager::Observer::~Observer() {}
-
-SyncManager::InitArgs::InitArgs()
-    : extensions_activity(NULL),
-      change_delegate(NULL),
-      encryptor(NULL),
-      cancelation_signal(NULL) {}
-
-SyncManager::InitArgs::~InitArgs() {}
-
-SyncManager::SyncManager() {}
-
-SyncManager::~SyncManager() {}
-
-}  // namespace syncer