Privatize StrongBinding lifetime management

components/leveldb/leveldb_database_impl.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/leveldb_database_impl.h"
 
 #include <map>
 #include <string>
 
 #include "base/optional.h"
@@ skipping 28 matching lines @@
     if (!it->key().starts_with(key_prefix))
       break;
     function(it->key(), it->value());
   }
   return it->status();
 }
 
 }  // namespace
 
 LevelDBDatabaseImpl::LevelDBDatabaseImpl(
-    leveldb::mojom::LevelDBDatabaseRequest request,
     std::unique_ptr<leveldb::Env> environment,
     std::unique_ptr<leveldb::DB> db)
-    : binding_(this, std::move(request)),
-      environment_(std::move(environment)),
-      db_(std::move(db)) {}
+    : environment_(std::move(environment)), db_(std::move(db)) {}
 
 LevelDBDatabaseImpl::~LevelDBDatabaseImpl() {
   for (auto& p : iterator_map_)
     delete p.second;
   for (auto& p : snapshot_map_)
     db_->ReleaseSnapshot(p.second);
 }
 
 void LevelDBDatabaseImpl::Put(const std::vector<uint8_t>& key,
                               const std::vector<uint8_t>& value,
@@ skipping 232 matching lines @@
     const leveldb::Slice& key_prefix,
     leveldb::WriteBatch* batch) {
   leveldb::Status status = ForEachWithPrefix(db_.get(), key_prefix,
       [batch](const leveldb::Slice& key, const leveldb::Slice& value) {
         batch->Delete(key);
       });
   return status;
 }
 
 }  // namespace leveldb