Save password without an associated username.

webkit/forms/password_form_dom_manager.h

Index: webkit/forms/password_form_dom_manager.h
===================================================================
--- webkit/forms/password_form_dom_manager.h	(revision 133421)
+++ webkit/forms/password_form_dom_manager.h	(working copy)
@@ -30,6 +30,11 @@
 struct WEBKIT_FORMS_EXPORT PasswordFormFillData {
   typedef std::map<string16, string16> LoginCollection;
 
+  // You should set a password basic_data.fields[0].
+  // If there's a username, you should set the username basic_data.fields[1].
+  // So, If basic_data.size() == 2, we judge it has username and password.
+  // And, basic_data.size() == 1, we judge it has only password.
+  // Otherwise, we supporse that it has wrong datas.
   FormData basic_data;
   LoginCollection additional_logins;
   bool wait_for_username;