[Password manager] Relplace the FormFieldData vector from autofill::FormData with named fields…

components/autofill/core/common/password_form_fill_data.cc

Index: components/autofill/core/common/password_form_fill_data.cc
diff --git a/components/autofill/core/common/password_form_fill_data.cc b/components/autofill/core/common/password_form_fill_data.cc
index 7dbc97d0ab62b42dc7b158bcea47b663d7fcd149..ebceaedb1f2695df6298d0bb4c65604951ab5266 100644
--- a/components/autofill/core/common/password_form_fill_data.cc
+++ b/components/autofill/core/common/password_form_fill_data.cc
@@ -50,8 +50,8 @@ void InitPasswordFormFillData(
   // Fill basic form data.
   result->basic_data.origin = form_on_page.origin;
   result->basic_data.action = form_on_page.action;
-  result->basic_data.fields.push_back(username_field);
-  result->basic_data.fields.push_back(password_field);
+  result->basic_data.username_field = username_field;
+  result->basic_data.password_field = password_field;
   result->wait_for_username = wait_for_username_before_autofill;
 
   result->preferred_realm = preferred_match->original_signon_realm;