mojo leveldb: Add an iteration interface.

components/leveldb/util.cc

-// 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/leveldb/util.h"
-
-#include "third_party/leveldatabase/src/include/leveldb/status.h"
-
-namespace leveldb {
-
-DatabaseError LeveldbStatusToError(const leveldb::Status& s) {
-  if (s.ok())
-    return DatabaseError::OK;
-  if (s.IsNotFound())
-    return DatabaseError::NOT_FOUND;
-  if (s.IsCorruption())
-    return DatabaseError::CORRUPTION;
-  if (s.IsNotSupportedError())
-    return DatabaseError::NOT_SUPPORTED;
-  if (s.IsIOError())
-    return DatabaseError::IO_ERROR;
-  return DatabaseError::INVALID_ARGUMENT;
-}
-
-leveldb::Slice GetSliceFor(const mojo::Array<uint8_t>& key) {
-  if (key.size() == 0)
-    return leveldb::Slice();
-  return leveldb::Slice(reinterpret_cast<const char*>(&key.front()),
-                        key.size());
-}
-
-}  // namespace leveldb