Instantiate AttachmentDownloader and use it in AttachmentServiceImpl

chrome/browser/sync/profile_sync_components_factory_impl.cc

Index: chrome/browser/sync/profile_sync_components_factory_impl.cc
diff --git a/chrome/browser/sync/profile_sync_components_factory_impl.cc b/chrome/browser/sync/profile_sync_components_factory_impl.cc
index 848272a6e6822f4d196edcc0231e23b8e397c623..18b3caec5939e754f993f256ab07a90d1120fb09 100644
--- a/chrome/browser/sync/profile_sync_components_factory_impl.cc
+++ b/chrome/browser/sync/profile_sync_components_factory_impl.cc
@@ -61,6 +61,7 @@
 #include "sync/api/attachments/attachment_service.h"
 #include "sync/api/attachments/attachment_service_impl.h"
 #include "sync/api/syncable_service.h"
+#include "sync/internal_api/public/attachments/fake_attachment_downloader.h"
 #include "sync/internal_api/public/attachments/fake_attachment_store.h"
 #include "sync/internal_api/public/attachments/fake_attachment_uploader.h"
 
@@ -574,14 +575,18 @@ ProfileSyncComponentsFactoryImpl::CreateAttachmentService(
   // 369536).
   scoped_ptr<syncer::AttachmentUploader> attachment_uploader(
       new syncer::FakeAttachmentUploader);
+  scoped_ptr<syncer::AttachmentDownloader> attachment_downloader(
+      new syncer::FakeAttachmentDownloader());
 
   scoped_ptr<syncer::AttachmentStore> attachment_store(
       new syncer::FakeAttachmentStore(
           BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE)));
 
   scoped_ptr<syncer::AttachmentService> attachment_service(
-      new syncer::AttachmentServiceImpl(
-          attachment_store.Pass(), attachment_uploader.Pass(), delegate));
+      new syncer::AttachmentServiceImpl(attachment_store.Pass(),
+                                        attachment_uploader.Pass(),
+                                        attachment_downloader.Pass(),
+                                        delegate));
 
   return attachment_service.Pass();
 }