Revert of Keep track of which attachments are referenced by which sync entries.

sync/api/attachments/fake_attachment_service.cc

Index: sync/api/attachments/fake_attachment_service.cc
diff --git a/sync/api/attachments/fake_attachment_service.cc b/sync/api/attachments/fake_attachment_service.cc
index 609c046a39598a91d00a497b73317933fe11b9e5..8e9e867f9ada7acde10079892cfde7cf2ff3a298 100644
--- a/sync/api/attachments/fake_attachment_service.cc
+++ b/sync/api/attachments/fake_attachment_service.cc
@@ -53,15 +53,10 @@
                                      callback));
 }
 
-void FakeAttachmentService::StoreAttachments(const AttachmentList& attachments,
-                                             const StoreCallback& callback) {
+void FakeAttachmentService::OnSyncDataAdd(const SyncData& sync_data) {
   DCHECK(CalledOnValidThread());
-  attachment_store_->Write(attachments,
-                           base::Bind(&FakeAttachmentService::WriteDone,
-                                      weak_ptr_factory_.GetWeakPtr(),
-                                      callback));
-  // TODO(maniscalco): Ensure the linked attachments are schedule for upload to
-  // the server (bug 356351).
+  // TODO(maniscalco): Ensure the linked attachments get persisted in local
+  // storage and schedule them for upload to the server (bug 356351).
 }
 
 void FakeAttachmentService::OnSyncDataDelete(const SyncData& sync_data) {
@@ -106,16 +101,4 @@
                                          base::Bind(callback, drop_result));
 }
 
-void FakeAttachmentService::WriteDone(const StoreCallback& callback,
-                                      const AttachmentStore::Result& result) {
-  AttachmentService::StoreResult store_result =
-      AttachmentService::STORE_UNSPECIFIED_ERROR;
-  if (result == AttachmentStore::SUCCESS) {
-    store_result = AttachmentService::STORE_SUCCESS;
-  }
-  // TODO(maniscalco): Deal with case where an error occurred (bug 361251).
-  base::MessageLoop::current()->PostTask(FROM_HERE,
-                                         base::Bind(callback, store_result));
-}
-
 }  // namespace syncer