Adds obscuring to credit card numbers when displayed....

chrome/browser/autofill/credit_card.cc

 // Copyright (c) 2010 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/autofill/credit_card.h"
 
 #include "app/l10n_util.h"
 #include "base/basictypes.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ skipping 185 matching lines @@
       set_verification_code(value);
       break;
 
     default:
       DLOG(ERROR) << "Attempting to set unknown info-type "
                   << type.field_type();
       break;
   }
 }
 
+string16 CreditCard::ObfuscatedNumber() const {
+  if (number().empty())
+    return string16();  // No CC number, means empty preview.
+  string16 result(ASCIIToUTF16("************"));
+  result.append(last_four_digits());
+
+  return result;
+}
+
 string16 CreditCard::PreviewSummary() const {
   string16 preview;
   if (number().empty())
     return preview;  // No CC number, means empty preview.
-  string16 obfuscated_cc_number(ASCIIToUTF16("************"));
-  obfuscated_cc_number.append(last_four_digits());
+  string16 obfuscated_cc_number = ObfuscatedNumber();
   if (!expiration_month() || !expiration_year())
     return obfuscated_cc_number;  // no expiration date set
   // TODO(georgey): internationalize date
   string16 formatted_date(ExpirationMonthAsString());
   formatted_date.append(ASCIIToUTF16("/"));
   formatted_date.append(Expiration4DigitYearAsString());
 
   preview = l10n_util::GetStringFUTF16(
       IDS_CREDIT_CARD_NUMBER_PREVIEW_FORMAT,
       obfuscated_cc_number,
@@ skipping 266 matching lines @@
       << " "
       << UTF16ToUTF8(creditcard.GetFieldText(
              AutoFillType(CREDIT_CARD_VERIFICATION_CODE)))
       << " "
       << UTF16ToUTF8(creditcard.GetFieldText(
              AutoFillType(CREDIT_CARD_EXP_MONTH)))
       << " "
       << UTF16ToUTF8(creditcard.GetFieldText(
              AutoFillType(CREDIT_CARD_EXP_4_DIGIT_YEAR)));
 }