[Sync] Refactor AttachmentStore classes. Introduce concept of referrer.

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 c71e48549377517dcd3384e54bf90d348db93b6d..6f078f16dc22eb0768037d2a8dc7bde4132c363f 100644
--- a/chrome/browser/sync/profile_sync_components_factory_impl.cc
+++ b/chrome/browser/sync/profile_sync_components_factory_impl.cc
@@ -640,7 +640,7 @@ OAuth2TokenService* TokenServiceProvider::GetTokenService() {
 
 scoped_ptr<syncer::AttachmentService>
 ProfileSyncComponentsFactoryImpl::CreateAttachmentService(
-    const scoped_refptr<syncer::AttachmentStore>& attachment_store,
+    scoped_ptr<syncer::AttachmentStore> attachment_store,
     const syncer::UserShare& user_share,
     const std::string& store_birthday,
     syncer::ModelType model_type,
@@ -685,12 +685,10 @@ ProfileSyncComponentsFactoryImpl::CreateAttachmentService(
       base::TimeDelta::FromMinutes(30);
   const base::TimeDelta max_backoff_delay = base::TimeDelta::FromHours(4);
   scoped_ptr<syncer::AttachmentService> attachment_service(
-      new syncer::AttachmentServiceImpl(attachment_store,
-                                        attachment_uploader.Pass(),
-                                        attachment_downloader.Pass(),
-                                        delegate,
-                                        initial_backoff_delay,
-                                        max_backoff_delay));
+      new syncer::AttachmentServiceImpl(
+          attachment_store.Pass(), attachment_uploader.Pass(),
+          attachment_downloader.Pass(), delegate, initial_backoff_delay,
+          max_backoff_delay));
   return attachment_service.Pass();
 }