Update some uses of char16 to use the base:: namespace.

components/autofill/core/browser/validation.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/validation.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "components/autofill/core/browser/autofill_regexes.h"
 #include "components/autofill/core/browser/credit_card.h"
 #include "components/autofill/core/browser/state_names.h"
 
 using base::StringPiece16;
 
 namespace {
 
 // The separator characters for SSNs.
-const char16 kSSNSeparators[] = {' ', '-', 0};
+const base::char16 kSSNSeparators[] = {' ', '-', 0};
 
 }  // namespace
 
 namespace autofill {
 
 bool IsValidCreditCardExpirationDate(const base::string16& year,
                                      const base::string16& month,
                                      const base::Time& now) {
   base::string16 year_cleaned, month_cleaned;
   TrimWhitespace(year, TRIM_ALL, &year_cleaned);
@@ skipping 179 matching lines @@
                                        number_string.begin() + 9),
                          &serial)
       || serial == 0) {
     return false;
   }
 
   return true;
 }
 
 }  // namespace autofill