Make various string_util functions take StringPieces instead of char[].

components/autofill/core/browser/credit_card.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/credit_card.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <ostream>
@@ skipping 115 matching lines @@
 
 CreditCard::CreditCard(const CreditCard& credit_card)
     : AutofillDataModel(std::string(), std::string()) {
   operator=(credit_card);
 }
 
 CreditCard::~CreditCard() {}
 
 // static
 const base::string16 CreditCard::StripSeparators(const base::string16& number) {
-  const base::char16 kSeparators[] = {'-', ' ', '\0'};
   base::string16 stripped;
-  base::RemoveChars(number, kSeparators, &stripped);
+  base::RemoveChars(number, base::ASCIIToUTF16("- "), &stripped);
   return stripped;
 }
 
 // static
 base::string16 CreditCard::TypeForDisplay(const std::string& type) {
   if (type == kAmericanExpressCard)
     return l10n_util::GetStringUTF16(IDS_AUTOFILL_CC_AMEX);
   if (type == kDinersCard)
     return l10n_util::GetStringUTF16(IDS_AUTOFILL_CC_DINERS);
   if (type == kDiscoverCard)
@@ skipping 537 matching lines @@
 const char* const kAmericanExpressCard = "americanExpressCC";
 const char* const kDinersCard = "dinersCC";
 const char* const kDiscoverCard = "discoverCC";
 const char* const kGenericCard = "genericCC";
 const char* const kJCBCard = "jcbCC";
 const char* const kMasterCard = "masterCardCC";
 const char* const kUnionPay = "unionPayCC";
 const char* const kVisaCard = "visaCC";
 
 }  // namespace autofill