[Payments] Added region load failure tolerance and tests to PR editor.

chrome/browser/ui/views/payments/validating_textfield_unittest.cc

 // 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.
 
 #include "chrome/browser/ui/views/payments/validating_textfield.h"
 
 #include <memory>
+#include <utility>
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/views/payments/validation_delegate.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/views/controls/textfield/textfield.h"
 
 namespace payments {
 
 class ValidatingTextfieldTest : public testing::Test {
  public:
   ValidatingTextfieldTest() {}
   ~ValidatingTextfieldTest() override {}
 
  protected:
   class TestValidationDelegate : public ValidationDelegate {
    public:
     TestValidationDelegate() {}
     ~TestValidationDelegate() override {}
 
     // ValidationDelegate:
     bool ValidateTextfield(views::Textfield* textfield) override {
       // We really don't like textfields with more than 5 characters in them.
       return textfield->text().size() <= 5u;
     }
     bool ValidateCombobox(views::Combobox* combobox) override { return true; }
+    void ComboboxModelChanged(views::Combobox* combobox) override {}
 
    private:
     DISALLOW_COPY_AND_ASSIGN(TestValidationDelegate);
   };
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ValidatingTextfieldTest);
 };
 
 TEST_F(ValidatingTextfieldTest, Validation) {
@@ skipping 17 matching lines @@
   // On further text adjustements, the validation runs now. Set a valid string
   // (<=5 characters).
   textfield->SetText(base::ASCIIToUTF16("good"));
   textfield->OnContentsChanged();
 
   // No longer invalid.
   EXPECT_FALSE(textfield->invalid());
 }
 
 }  // namespace payments