[USS] Add SyncMetadataStore interface

components/autofill/core/browser/webdata/autofill_metadata_change_list.cc

Index: components/autofill/core/browser/webdata/autofill_metadata_change_list.cc
diff --git a/components/autofill/core/browser/webdata/autofill_metadata_change_list.cc b/components/autofill/core/browser/webdata/autofill_metadata_change_list.cc
deleted file mode 100644
index 24876e4a0cff1b7dd51b5dec518717e20ec9dae8..0000000000000000000000000000000000000000
--- a/components/autofill/core/browser/webdata/autofill_metadata_change_list.cc
+++ /dev/null
@@ -1,75 +0,0 @@
-// Copyright 2016 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 "components/autofill/core/browser/webdata/autofill_metadata_change_list.h"
-
-#include "base/location.h"
-
-using base::Optional;
-using syncer::ModelError;
-
-namespace autofill {
-
-AutofillMetadataChangeList::AutofillMetadataChangeList(AutofillTable* table,
-                                                       syncer::ModelType type)
-    : table_(table), type_(type) {
-  DCHECK(table_);
-  // This should be changed as new autofill types are converted to USS.
-  DCHECK_EQ(syncer::AUTOFILL, type_);
-}
-
-AutofillMetadataChangeList::~AutofillMetadataChangeList() {
-  DCHECK(!error_);
-}
-
-void AutofillMetadataChangeList::UpdateModelTypeState(
-    const sync_pb::ModelTypeState& model_type_state) {
-  if (error_) {
-    return;
-  }
-
-  if (!table_->UpdateModelTypeState(type_, model_type_state)) {
-    error_ = ModelError(FROM_HERE, "Failed to update ModelTypeState.");
-  }
-}
-
-void AutofillMetadataChangeList::ClearModelTypeState() {
-  if (error_) {
-    return;
-  }
-
-  if (!table_->ClearModelTypeState(type_)) {
-    error_ = ModelError(FROM_HERE, "Failed to clear ModelTypeState.");
-  }
-}
-
-void AutofillMetadataChangeList::UpdateMetadata(
-    const std::string& storage_key,
-    const sync_pb::EntityMetadata& metadata) {
-  if (error_) {
-    return;
-  }
-
-  if (!table_->UpdateSyncMetadata(type_, storage_key, metadata)) {
-    error_ = ModelError(FROM_HERE, "Failed to update entity metadata.");
-  }
-}
-
-void AutofillMetadataChangeList::ClearMetadata(const std::string& storage_key) {
-  if (error_) {
-    return;
-  }
-
-  if (!table_->ClearSyncMetadata(type_, storage_key)) {
-    error_ = ModelError(FROM_HERE, "Failed to clear entity metadata.");
-  }
-}
-
-Optional<ModelError> AutofillMetadataChangeList::TakeError() {
-  Optional<ModelError> temp = error_;
-  error_.reset();
-  return temp;
-}
-
-}  // namespace autofill