Persist the choice of AutofillDataModel when using the requestAutocomplete 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>
 
@@ skipping 54 matching lines @@
   std::string GetItemKeyAt(int index) const;
 
   // Returns the ID key for the item at |checked_item_|, or an empty string if
   // there are no items.
   std::string GetItemKeyForCheckedItem() const;
 
   // Sets which item is checked.
   void SetCheckedItem(const std::string& item_key);
   void SetCheckedIndex(size_t index);
 
+  // Sets the item to be checked to the |n|th item that has key |item_key|.
+  // If there are fewer than |n| items that share |item_key|, the last one
+  // becomes checked. If there is no item with |item_key|, nothing happens.
+  // |n| is 1-indexed.
+  void SetCheckedItemNthWithKey(const std::string& item_key, size_t n);
+
+  int checked_item() const { return checked_item_; }
+
   // Enable/disable an item by key.
   void SetEnabled(const std::string& item_key, bool enabled);
 
-  int checked_item() { return checked_item_; }
-
   // ui::SimpleMenuModel::Delegate implementation.
   virtual bool IsCommandIdChecked(int command_id) const OVERRIDE;
   virtual bool IsCommandIdEnabled(int command_id) const OVERRIDE;
   virtual bool GetAcceleratorForCommandId(
       int command_id,
       ui::Accelerator* accelerator) OVERRIDE;
   virtual void ExecuteCommand(int command_id, int event_flags) OVERRIDE;
 
  private:
   // Represents an item in this model.
@@ skipping 46 matching lines @@
  private:
   // The current year (e.g., 2012).
   int this_year_;
 
   DISALLOW_COPY_AND_ASSIGN(YearComboboxModel);
 };
 
 }  // autofill
 
 #endif  // CHROME_BROWSER_UI_AUTOFILL_AUTOFILL_DIALOG_MODELS_H_