[Sync] Replace AttachmentIdSet with AttachmentIdList in interfaces.

sync/internal_api/attachments/attachment_service_proxy.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 "sync/internal_api/public/attachments/attachment_service_proxy.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/thread_task_runner_handle.h"
 
@@ skipping 48 matching lines @@
                  callback);
   wrapped_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&AttachmentService::GetOrDownloadAttachments,
                  core_,
                  attachment_ids,
                  proxy_callback));
 }
 
 void AttachmentServiceProxy::UploadAttachments(
-    const AttachmentIdSet& attachment_ids) {
+    const AttachmentIdList& attachment_ids) {
   DCHECK(wrapped_task_runner_.get());
   wrapped_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&AttachmentService::UploadAttachments, core_, attachment_ids));
 }
 
 AttachmentServiceProxy::Core::Core(
     const base::WeakPtr<syncer::AttachmentService>& wrapped)
     : wrapped_(wrapped) {
 }
 
 AttachmentServiceProxy::Core::~Core() {
 }
 
 void AttachmentServiceProxy::Core::GetOrDownloadAttachments(
     const AttachmentIdList& attachment_ids,
     const GetOrDownloadCallback& callback) {
   if (!wrapped_) {
     return;
   }
   wrapped_->GetOrDownloadAttachments(attachment_ids, callback);
 }
 
 void AttachmentServiceProxy::Core::UploadAttachments(
-    const AttachmentIdSet& attachment_ids) {
+    const AttachmentIdList& attachment_ids) {
   if (!wrapped_) {
     return;
   }
   wrapped_->UploadAttachments(attachment_ids);
 }
 
 }  // namespace syncer