[Payments] Have expiration date be on the same line in CC editor

chrome/browser/ui/views/payments/editor_view_controller.h

Index: chrome/browser/ui/views/payments/editor_view_controller.h
diff --git a/chrome/browser/ui/views/payments/editor_view_controller.h b/chrome/browser/ui/views/payments/editor_view_controller.h
index 60e229c09fda672f524ec42b19d816fb628b4f12..10cf521dfc03aee4455b0a1ef565a8916ad4958f 100644
--- a/chrome/browser/ui/views/payments/editor_view_controller.h
+++ b/chrome/browser/ui/views/payments/editor_view_controller.h
@@ -57,12 +57,6 @@ struct EditorField {
         required(required),
         control_type(control_type) {}
 
-  struct Compare {
-    bool operator()(const EditorField& lhs, const EditorField& rhs) const {
-      return std::tie(lhs.type, lhs.label) < std::tie(rhs.type, rhs.label);
-    }
-  };
-
   // Data type in the field.
   autofill::ServerFieldType type;
   // Label to be shown alongside the field.
@@ -85,8 +79,7 @@ class EditorViewController : public PaymentRequestSheetController,
       std::unordered_map<ValidatingTextfield*, const EditorField>;
   using ComboboxMap =
       std::unordered_map<ValidatingCombobox*, const EditorField>;
-  using ErrorLabelMap =
-      std::map<const EditorField, views::View*, EditorField::Compare>;
+  using ErrorLabelMap = std::map<autofill::ServerFieldType, views::View*>;
 
   // Does not take ownership of the arguments, which should outlive this object.
   // |back_navigation_type| identifies what sort of back navigation should be
@@ -99,8 +92,8 @@ class EditorViewController : public PaymentRequestSheetController,
   ~EditorViewController() override;
 
   // Will display |error_message| alongside the input field represented by
-  // |field|.
-  void DisplayErrorMessageForField(const EditorField& field,
+  // field |type|.
+  void DisplayErrorMessageForField(autofill::ServerFieldType type,
                                    const base::string16& error_message);
 
   const ComboboxMap& comboboxes() const { return comboboxes_; }
@@ -147,6 +140,11 @@ class EditorViewController : public PaymentRequestSheetController,
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
   views::View* GetFirstFocusedView() override;
 
+  // Will create a combobox according to the |field| definition. Will also keep
+  // track of this field to populate the edited model on save.
+  std::unique_ptr<ValidatingCombobox> CreateComboboxForField(
+      const EditorField& field);
+
  private:
   // views::TextfieldController:
   void ContentsChanged(views::Textfield* sender,