set a default country in the autofill dialog.

chrome/browser/ui/autofill/autofill_dialog_models.h

 // Copyright (c) 2012 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_AUTOFILL_AUTOFILL_DIALOG_MODELS_H_
 #define CHROME_BROWSER_UI_AUTOFILL_AUTOFILL_DIALOG_MODELS_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/memory/scoped_vector.h"
 #include "base/string16.h"
+#include "chrome/browser/autofill/autofill_country.h"

[Ilya Sherman, 2013/02/26 00:31:13]

nit: Can you forward-declare this?

 #include "ui/base/models/combobox_model.h"
 #include "ui/base/models/simple_menu_model.h"
 
 namespace autofill {
 
 class SuggestionsMenuModel;
 
 class SuggestionsMenuModelDelegate {
  public:
   virtual ~SuggestionsMenuModelDelegate();
@@ skipping 81 matching lines @@
 
 // A model for countries.
 class CountryComboboxModel : public ui::ComboboxModel {
  public:
   CountryComboboxModel();
   virtual ~CountryComboboxModel();
 
   // ui::Combobox implementation:
   virtual int GetItemCount() const OVERRIDE;
   virtual string16 GetItemAt(int index) OVERRIDE;
+  virtual int GetDefaultIndex() const OVERRIDE;
 
  private:
   // The list of all countries.
-  std::vector<std::string> country_codes_;
+  ScopedVector<AutofillCountry> countries_;
 
   DISALLOW_COPY_AND_ASSIGN(CountryComboboxModel);
 };
 
 }  // autofill
 
 #endif  // CHROME_BROWSER_UI_AUTOFILL_AUTOFILL_DIALOG_MODELS_H_