Use a scoped_refptr in the IndexedDBCallbacks constructor.

content/browser/indexed_db/indexed_db_callbacks.cc

Index: content/browser/indexed_db/indexed_db_callbacks.cc
diff --git a/content/browser/indexed_db/indexed_db_callbacks.cc b/content/browser/indexed_db/indexed_db_callbacks.cc
index 57109ec7d91eab0d6f056373edbb279e8b6b498e..2c24fa5e28c36cf2f359262f2d21ff5446ac8ee3 100644
--- a/content/browser/indexed_db/indexed_db_callbacks.cc
+++ b/content/browser/indexed_db/indexed_db_callbacks.cc
@@ -141,10 +141,10 @@ class IndexedDBCallbacks::IOThreadHelper {
 };
 
 IndexedDBCallbacks::IndexedDBCallbacks(
-    IndexedDBDispatcherHost* dispatcher_host,
+    scoped_refptr<IndexedDBDispatcherHost> dispatcher_host,
     const url::Origin& origin,
     ::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks_info)
-    : dispatcher_host_(dispatcher_host),
+    : dispatcher_host_(std::move(dispatcher_host)),
       host_transaction_id_(kNoTransaction),
       origin_(origin),
       data_loss_(blink::WebIDBDataLossNone),