rAc - do less work when model changes

chrome/browser/ui/autofill/autofill_dialog_controller_impl.cc

 // Copyright 2013 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/autofill/autofill_dialog_controller_impl.h"
 
 #include <algorithm>
 #include <map>
 #include <string>
 
@@ skipping 3304 matching lines @@
 }
 
 bool AutofillDialogControllerImpl::IsCreditCardExpirationValid(
     const base::string16& year,
     const base::string16& month) const {
   // If the expiration is in the past as per the local clock, it's invalid.
   base::Time now = base::Time::Now();
   if (!autofill::IsValidCreditCardExpirationDate(year, month, now))
     return false;
 
-  if (IsPayingWithWallet() && IsEditingExistingData(SECTION_CC_BILLING)) {
-    const wallet::WalletItems::MaskedInstrument* instrument =
-        ActiveInstrument();
+  const wallet::WalletItems::MaskedInstrument* instrument =
+      ActiveInstrument();
+  if (instrument) {
     const std::string& locale = g_browser_process->GetApplicationLocale();
     int month_int;
     if (base::StringToInt(month, &month_int) &&
         instrument->status() ==
             wallet::WalletItems::MaskedInstrument::EXPIRED &&
         year ==
             instrument->GetInfo(
                 AutofillType(CREDIT_CARD_EXP_4_DIGIT_YEAR), locale) &&
         month_int == instrument->expiration_month()) {
       // Otherwise, if the user is editing an instrument that's deemed expired
@@ skipping 472 matching lines @@
   view_->UpdateButtonStrip();
 }
 
 void AutofillDialogControllerImpl::FetchWalletCookie() {
   net::URLRequestContextGetter* request_context = profile_->GetRequestContext();
   signin_helper_.reset(new wallet::WalletSigninHelper(this, request_context));
   signin_helper_->StartWalletCookieValueFetch();
 }
 
 }  // namespace autofill