CREDENTIAL: Serialize 'PasswordCredential' objects with "" as the federation.

chrome/browser/password_manager/native_backend_gnome_x.cc

Index: chrome/browser/password_manager/native_backend_gnome_x.cc
diff --git a/chrome/browser/password_manager/native_backend_gnome_x.cc b/chrome/browser/password_manager/native_backend_gnome_x.cc
index 663f49a6db891e5121e7ee0fb1231b0d4429df45..53c671b9583e2faff7ab64a813c8e4a45c8d519e 100644
--- a/chrome/browser/password_manager/native_backend_gnome_x.cc
+++ b/chrome/browser/password_manager/native_backend_gnome_x.cc
@@ -370,7 +370,11 @@ void GKRMethod::AddLogin(const PasswordForm& form, const char* app_string) {
       "date_synced", base::Int64ToString(date_synced).c_str(),
       "display_name", UTF16ToUTF8(form.display_name).c_str(),
       "avatar_url", form.icon_url.spec().c_str(),
-      "federation_url", form.federation_origin.Serialize().c_str(),
+      // We serialize unique origins as "", in order to make other systems that
+      // read from the login database happy. https://crbug.com/591310
+      "federation_url", form.federation_origin.unique()
+          ? ""
+          : form.federation_origin.Serialize().c_str(),
       "should_skip_zero_click", form.skip_zero_click,
       "generation_upload_status", form.generation_upload_status,
       "form_data", form_data.c_str(),