[Sync] Remove DropAttachments from AttachmentService and SyncData

sync/internal_api/attachments/attachment_service_impl.cc

Index: sync/internal_api/attachments/attachment_service_impl.cc
diff --git a/sync/internal_api/attachments/attachment_service_impl.cc b/sync/internal_api/attachments/attachment_service_impl.cc
index dab7aa73f8f283150372e3c216cac02f8b074569..cc04408ef332c76f8afcb8b3e9ec11a8e7711ba9 100644
--- a/sync/internal_api/attachments/attachment_service_impl.cc
+++ b/sync/internal_api/attachments/attachment_service_impl.cc
@@ -176,16 +176,6 @@ void AttachmentServiceImpl::GetOrDownloadAttachments(
                                      state));
 }
 
-void AttachmentServiceImpl::DropAttachments(
-    const AttachmentIdList& attachment_ids,
-    const DropCallback& callback) {
-  DCHECK(CalledOnValidThread());
-  attachment_store_->Drop(attachment_ids,
-                          base::Bind(&AttachmentServiceImpl::DropDone,
-                                     weak_ptr_factory_.GetWeakPtr(),
-                                     callback));
-}
-
 void AttachmentServiceImpl::ReadDone(
     const scoped_refptr<GetOrDownloadState>& state,
     const AttachmentStore::Result& result,
@@ -234,18 +224,6 @@ void AttachmentServiceImpl::WriteDone(
   }
 }
 
-void AttachmentServiceImpl::DropDone(const DropCallback& callback,
-                                     const AttachmentStore::Result& result) {
-  AttachmentService::DropResult drop_result =
-      AttachmentService::DROP_UNSPECIFIED_ERROR;
-  if (result == AttachmentStore::SUCCESS) {
-    drop_result = AttachmentService::DROP_SUCCESS;
-  }
-  // TODO(maniscalco): Deal with case where an error occurred (bug 361251).
-  base::MessageLoop::current()->PostTask(FROM_HERE,
-                                         base::Bind(callback, drop_result));
-}
-
 void AttachmentServiceImpl::UploadDone(
     const AttachmentUploader::UploadResult& result,
     const AttachmentId& attachment_id) {