[Leveldb] Use std::{string,vector} instead of mojo::{String,Array}.

components/leveldb/public/cpp/remote_iterator.h

 // 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.
 
 #ifndef COMPONENTS_LEVELDB_PUBLIC_CPP_REMOTE_ITERATOR_H_
 #define COMPONENTS_LEVELDB_PUBLIC_CPP_REMOTE_ITERATOR_H_
 
 #include "components/leveldb/public/interfaces/leveldb.mojom.h"
-#include "mojo/public/cpp/bindings/array.h"
 #include "third_party/leveldatabase/src/include/leveldb/iterator.h"
 
 namespace leveldb {
 
 // A wrapper around the raw iterator movement methods on the mojo leveldb
 // interface to allow drop in replacement to current leveldb usage.
 //
 // Note: Next(), Prev() and all the Seek*() calls cause mojo sync calls.
 class RemoteIterator : public Iterator {
  public:
@@ skipping 10 matching lines @@
   Slice key() const override;
   Slice value() const override;
   Status status() const override;
 
  private:
   mojom::LevelDBDatabase* database_;
   uint64_t iterator_id_;
 
   bool valid_;
   mojom::DatabaseError status_;
-  mojo::Array<uint8_t> key_;
-  mojo::Array<uint8_t> value_;
+  base::Optional<std::vector<uint8_t>> key_;
+  base::Optional<std::vector<uint8_t>> value_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteIterator);
 };
 
 }  // namespace leveldb
 
 #endif  // COMPONENTS_LEVELDB_PUBLIC_CPP_REMOTE_ITERATOR_H_