[rAc] Reset the user's selection to the new default when the default Wallet item changes.

chrome/browser/ui/autofill/autofill_dialog_controller_impl.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_CONTROLLER_IMPL_H_
 #define CHROME_BROWSER_UI_AUTOFILL_AUTOFILL_DIALOG_CONTROLLER_IMPL_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 552 matching lines @@
   // The helper is set only during fetch/sign-in, and NULL otherwise.
   scoped_ptr<wallet::WalletSigninHelper> signin_helper_;
 
   // A client to talk to the Online Wallet API.
   wallet::WalletClient wallet_client_;
 
   // Recently received items retrieved via |wallet_client_|.
   scoped_ptr<wallet::WalletItems> wallet_items_;
   scoped_ptr<wallet::FullWallet> full_wallet_;
 
-  // The last active instrument and shipping address object ids. These
+  // The default active instrument and shipping address object IDs as of the
+  // last time Wallet items were fetched. These variables are only set
+  // (i.e. non-empty) when the Wallet items are being re-fetched.
+  std::string previous_default_instrument_id_;
+  std::string previous_default_shipping_address_id_;
+  // The last active instrument and shipping address object IDs. These
   // variables are only set (i.e. non-empty) when the Wallet items are being
   // re-fetched.
   std::string previously_selected_instrument_id_;
   std::string previously_selected_shipping_address_id_;
 
   // When the Wallet items were last fetched.
   base::TimeTicks last_wallet_items_fetch_timestamp_;
 
   // Local machine signals to pass along on each request to trigger (or
   // discourage) risk challenges; sent if the user is up to date on legal docs.
@@ skipping 100 matching lines @@
   // show a bubble as the dialog closes to confirm a user's new card info was
   // saved. Never populated while incognito (as nothing's actually saved).
   scoped_ptr<CreditCard> newly_saved_card_;
 
   DISALLOW_COPY_AND_ASSIGN(AutofillDialogControllerImpl);
 };
 
 }  // namespace autofill
 
 #endif  // CHROME_BROWSER_UI_AUTOFILL_AUTOFILL_DIALOG_CONTROLLER_IMPL_H_