[Coverity] Extension pointer can be null in the if clause, so we should rely on extension_id

chrome/browser/extensions/api/developer_private/developer_private_api.cc

Index: chrome/browser/extensions/api/developer_private/developer_private_api.cc
diff --git a/chrome/browser/extensions/api/developer_private/developer_private_api.cc b/chrome/browser/extensions/api/developer_private/developer_private_api.cc
index c0c4e5be42ae426dd72edbedc2677c196a8bea40..b8b49390816b3c1deaa1238770b77ded1943fcb6 100644
--- a/chrome/browser/extensions/api/developer_private/developer_private_api.cc
+++ b/chrome/browser/extensions/api/developer_private/developer_private_api.cc
@@ -653,7 +653,7 @@ bool DeveloperPrivateEnableFunction::RunImpl() {
   if (!extension ||
       !management_policy->UserMayModifySettings(extension, NULL)) {
     LOG(ERROR) << "Attempt to enable an extension that is non-usermanagable "
-               "was made. Extension id: " << extension->id();
+               "was made. Extension id: " << extension_id.c_str();
     return false;
   }