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

components/leveldb/public/cpp/remote_iterator.h

Index: components/leveldb/public/cpp/remote_iterator.h
diff --git a/components/leveldb/public/cpp/remote_iterator.h b/components/leveldb/public/cpp/remote_iterator.h
index 1d3920ba1231ccb132a751fdf80b23ae40ccf7f4..0a4ae36d1e0bc8047e2afd3102b6ebb8bf0a3254 100644
--- a/components/leveldb/public/cpp/remote_iterator.h
+++ b/components/leveldb/public/cpp/remote_iterator.h
@@ -6,7 +6,6 @@
 #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 {
@@ -37,8 +36,8 @@ class RemoteIterator : public Iterator {
 
   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);
 };