[IndexedDB] Refactoring to remove ref ptrs and host transaction ids.

content/browser/indexed_db/indexed_db_class_factory.cc

 // Copyright 2014 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 "content/browser/indexed_db/indexed_db_class_factory.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "content/browser/indexed_db/indexed_db_transaction.h"
@@ skipping 18 matching lines @@
 }
 
 scoped_refptr<IndexedDBDatabase> IndexedDBClassFactory::CreateIndexedDBDatabase(
     const base::string16& name,
     IndexedDBBackingStore* backing_store,
     IndexedDBFactory* factory,
     const IndexedDBDatabase::Identifier& unique_identifier) {
   return new IndexedDBDatabase(name, backing_store, factory, unique_identifier);
 }
 
-IndexedDBTransaction* IndexedDBClassFactory::CreateIndexedDBTransaction(
+std::unique_ptr<IndexedDBTransaction>
+IndexedDBClassFactory::CreateIndexedDBTransaction(
     int64_t id,
-    base::WeakPtr<IndexedDBConnection> connection,
+    IndexedDBConnection* connection,
     const std::set<int64_t>& scope,
     blink::WebIDBTransactionMode mode,
     IndexedDBBackingStore::Transaction* backing_store_transaction) {
-  // The transaction adds itself to |connection|'s database's transaction
-  // coordinator, which owns the object.
-  IndexedDBTransaction* transaction = new IndexedDBTransaction(
-      id, std::move(connection), scope, mode, backing_store_transaction);
-  return transaction;
+  return std::unique_ptr<IndexedDBTransaction>(new IndexedDBTransaction(
+      id, connection, scope, mode, backing_store_transaction));
 }
 
 scoped_refptr<LevelDBTransaction>
 IndexedDBClassFactory::CreateLevelDBTransaction(LevelDBDatabase* db) {
   return new LevelDBTransaction(db);
 }
 
 std::unique_ptr<LevelDBIteratorImpl> IndexedDBClassFactory::CreateIteratorImpl(
     std::unique_ptr<leveldb::Iterator> iterator) {
   return base::WrapUnique(new LevelDBIteratorImpl(std::move(iterator)));
 }
 
 }  // namespace content