Don't ever attempt to upload credit cards whose numbers match.

components/autofill/core/browser/personal_data_manager.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 "components/autofill/core/browser/personal_data_manager.h"
 
 #include <stddef.h>
 #include <algorithm>
 #include <list>
 #include <map>
@@ skipping 1407 matching lines @@
       // If we should not return the local card, return that we merged it,
       // without setting |imported_credit_card|.
       if (!should_return_local_card)
         return true;
 
       break;
     }
   }
 
   // Also don't offer to save if we already have this stored as a server card.
+  // We only check the number because if the new card has the same number as the
+  // server card, upload is guaranteed to fail. There's no mechanism for entries
+  // with the same number but different names or expiration dates as there is
+  // for local cards.
   for (const CreditCard* card : server_credit_cards_) {
-    if (candidate_credit_card.IsLocalDuplicateOfServerCard(*card))
+    if (candidate_credit_card.HasSameNumberAs(*card))
       return false;
   }
 
   imported_credit_card->reset(new CreditCard(candidate_credit_card));
   return true;
 }
 
 const std::vector<AutofillProfile*>& PersonalDataManager::GetProfiles(
     bool record_metrics) const {
   profiles_.clear();
   profiles_.insert(profiles_.end(), web_profiles().begin(),
                    web_profiles().end());
   if (pref_service_->GetBoolean(prefs::kAutofillWalletImportEnabled)) {
     profiles_.insert(
         profiles_.end(), server_profiles_.begin(), server_profiles_.end());
   }
   return profiles_;
 }
 
 }  // namespace autofill