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

components/leveldb/public/cpp/remote_iterator.cc

Index: components/leveldb/public/cpp/remote_iterator.cc
diff --git a/components/leveldb/public/cpp/remote_iterator.cc b/components/leveldb/public/cpp/remote_iterator.cc
index b1042f70a53424e1012a14ac6489dd543d4e8f35..c7e0c4ac962f067f681445f7727625de097e8282 100644
--- a/components/leveldb/public/cpp/remote_iterator.cc
+++ b/components/leveldb/public/cpp/remote_iterator.cc
@@ -34,7 +34,7 @@ void RemoteIterator::SeekToLast() {
 }
 
 void RemoteIterator::Seek(const Slice& target) {
-  database_->IteratorSeek(iterator_id_, GetArrayFor(target), &valid_, &status_,
+  database_->IteratorSeek(iterator_id_, GetVectorFor(target), &valid_, &status_,
                           &key_, &value_);
 }
 
@@ -47,15 +47,19 @@ void RemoteIterator::Prev() {
 }
 
 Slice RemoteIterator::key() const {
-  return GetSliceFor(key_);
+  if (!key_)
+    return leveldb::Slice();
+  return GetSliceFor(*key_);
 }
 
 Slice RemoteIterator::value() const {
-  return GetSliceFor(value_);
+  if (!value_)
+    return leveldb::Slice();
+  return GetSliceFor(*value_);
 }
 
 Status RemoteIterator::status() const {
-  return DatabaseErrorToStatus(status_, GetSliceFor(key_), GetSliceFor(value_));
+  return DatabaseErrorToStatus(status_, key(), value());
 }
 
 }  // namespace leveldb