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

content/browser/indexed_db/indexed_db_class_factory.h

Index: content/browser/indexed_db/indexed_db_class_factory.h
diff --git a/content/browser/indexed_db/indexed_db_class_factory.h b/content/browser/indexed_db/indexed_db_class_factory.h
index f8b359d15f1b6915cc34f2f0a633418dc1b681f2..a68ffd052c8bd43dd1cfb9cb96f94e405b29886e 100644
--- a/content/browser/indexed_db/indexed_db_class_factory.h
+++ b/content/browser/indexed_db/indexed_db_class_factory.h
@@ -47,9 +47,9 @@ class CONTENT_EXPORT IndexedDBClassFactory {
       IndexedDBFactory* factory,
       const IndexedDBDatabase::Identifier& unique_identifier);
 
-  virtual IndexedDBTransaction* CreateIndexedDBTransaction(
+  virtual std::unique_ptr<IndexedDBTransaction> CreateIndexedDBTransaction(
       int64_t id,
-      base::WeakPtr<IndexedDBConnection> connection,
+      IndexedDBConnection* connection,
       const std::set<int64_t>& scope,
       blink::WebIDBTransactionMode mode,
       IndexedDBBackingStore::Transaction* backing_store_transaction);