[Payments] Add combobox support to editors.

ui/views/controls/combobox/combobox.cc

Index: ui/views/controls/combobox/combobox.cc
diff --git a/ui/views/controls/combobox/combobox.cc b/ui/views/controls/combobox/combobox.cc
index abcb93408fa123efeeafecbc2c34c6e26fb82752..cadbfa49efd367ed131bc4e0438cde90ddbe24d2 100644
--- a/ui/views/controls/combobox/combobox.cc
+++ b/ui/views/controls/combobox/combobox.cc
@@ -15,7 +15,6 @@
 #include "ui/base/default_style.h"
 #include "ui/base/ime/input_method.h"
 #include "ui/base/material_design/material_design_controller.h"
-#include "ui/base/models/combobox_model.h"
 #include "ui/base/models/combobox_model_observer.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/events/event.h"
@@ -394,6 +393,11 @@ class Combobox::ComboboxMenuModel : public ui::MenuModel,
 ////////////////////////////////////////////////////////////////////////////////
 // Combobox, public:
 
+Combobox::Combobox(std::unique_ptr<ui::ComboboxModel> model, Style style)
+    : Combobox(model.get(), style) {
+  owned_model_ = std::move(model);
+}
+
 Combobox::Combobox(ui::ComboboxModel* model, Style style)
     : model_(model),
       style_(style),