Accept empty username as sync username in IsSyncAccountCredential

components/password_manager/sync/browser/password_sync_util.cc

Index: components/password_manager/sync/browser/password_sync_util.cc
diff --git a/components/password_manager/sync/browser/password_sync_util.cc b/components/password_manager/sync/browser/password_sync_util.cc
index 19292c5811c303394ff686b6cca8fc7358a5737d..9eadfdf4f1cb38964bf135af39c59e9847fc5e4f 100644
--- a/components/password_manager/sync/browser/password_sync_util.cc
+++ b/components/password_manager/sync/browser/password_sync_util.cc
@@ -39,6 +39,12 @@ bool IsSyncAccountCredential(const autofill::PasswordForm& form,
     return false;
   }
 
+  // The empty username can mean that Chrome did not detect it correctly. For
+  // reasons described in http://crbug.com/636292#c1, the username is suspected
+  // to be the sync username unless proven otherwise.
+  if (form.username_value.empty())
+    return true;
+
   return gaia::AreEmailsSame(
       base::UTF16ToUTF8(form.username_value),
       GetSyncUsernameIfSyncingPasswords(sync_service, signin_manager));