[Payments] In shipping address editor, enable required + phone validation.

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

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_PAYMENTS_SHIPPING_ADDRESS_EDITOR_VIEW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_PAYMENTS_SHIPPING_ADDRESS_EDITOR_VIEW_CONTROLLER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 40 matching lines @@
     ~ShippingAddressValidationDelegate() override;
 
     // ValidationDelegate:
     bool ValidateTextfield(views::Textfield* textfield) override;
     bool ValidateCombobox(views::Combobox* combobox) override;
 
    private:
     bool ValidateValue(const base::string16& value);
 
     EditorField field_;
-    // TODO(mad): Bring back when needed.
-    // ShippingAddressEditorViewController* parent_{nullptr};
+    // Raw pointer back to the owner of this class, therefore will not be null.
+    ShippingAddressEditorViewController* controller_;
 
     DISALLOW_COPY_AND_ASSIGN(ShippingAddressValidationDelegate);
   };
   friend class ShippingAddressValidationDelegate;
 
   // List of fields, reset everytime the current country changes.
   std::vector<EditorField> editor_fields_;
 
   // The currently chosen country. Defaults to 0 as the first entry in the
   // combobox, which is the generated default value received from
   // autofill::CountryComboboxModel::countries() which is documented to always
   // have the default country at the top as well as within the sorted list.
   size_t chosen_country_index_{0};
 
   // The list of country codes as ordered in the country combobox model.
   std::vector<std::string> country_codes_;
 
   // Updates |editor_fields_| based on the current country.
   void UpdateEditorFields();
 
   // Called by the validation delegate when the country combobox changed.
   void OnCountryChanged(views::Combobox* combobox);
 
   DISALLOW_COPY_AND_ASSIGN(ShippingAddressEditorViewController);
 };
 
 }  // namespace payments
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_SHIPPING_ADDRESS_EDITOR_VIEW_CONTROLLER_H_