Use the new fingerprint during unpacking, not the old.

components/update_client/action_update.cc

Index: components/update_client/action_update.cc
diff --git a/components/update_client/action_update.cc b/components/update_client/action_update.cc
index 08c13acfd93e4c444c6cd68886d2c6210dc29b2f..fef4eb8db026894ac9e1121f7c9379e7ccdf338a 100644
--- a/components/update_client/action_update.cc
+++ b/components/update_client/action_update.cc
@@ -139,7 +139,7 @@ void ActionUpdate::DoInstallOnBlockingTaskRunner(
     CrxUpdateItem* item,
     const base::FilePath& crx_path) {
   unpacker_ = new ComponentUnpacker(
-      item->component.pk_hash, crx_path, item->component.fingerprint,
+      item->component.pk_hash, crx_path, item->next_fp,
       item->component.installer,
       update_context->config->CreateOutOfProcessPatcher(),
       update_context->blocking_task_runner);