[Sync] Move attachments code out of core/.

components/sync/api/attachments/attachment.cc

 // Copyright 2014 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/api/attachments/attachment.h"
 
 #include "base/logging.h"
-#include "components/sync/core/attachments/attachment_util.h"
+#include "components/sync/engine/attachments/attachment_util.h"
 
 namespace syncer {
 
 Attachment::Attachment(const Attachment& other) = default;
 
 Attachment::~Attachment() {}
 
 // Static.
 Attachment Attachment::Create(
     const scoped_refptr<base::RefCountedMemory>& data) {
@@ skipping 21 matching lines @@
 }
 
 Attachment::Attachment(const AttachmentId& id,
                        const scoped_refptr<base::RefCountedMemory>& data)
     : id_(id), data_(data) {
   DCHECK_EQ(id.GetSize(), data->size());
   DCHECK(data.get());
 }
 
 }  // namespace syncer