Replace ToLower calls to the new format

chrome/browser/chromeos/login/supervised/supervised_user_authentication.cc

 // Copyright 2014 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/chromeos/login/supervised/supervised_user_authentication.h"
 
 #include "base/base64.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/macros.h"
 #include "base/metrics/histogram.h"
@@ skipping 22 matching lines @@
 // Size of key signature.
 const unsigned kHMACKeySizeInBits = 256;
 const int kSignatureLength = 32;
 
 // Size of master key (in bytes).
 const int kMasterKeySize = 32;
 
 std::string CreateSalt() {
     char result[kSaltSize];
     crypto::RandBytes(&result, sizeof(result));
-    return base::StringToLowerASCII(base::HexEncode(
-        reinterpret_cast<const void*>(result),
-        sizeof(result)));
+    return base::ToLowerASCII(
+        base::HexEncode(reinterpret_cast<const void*>(result), sizeof(result)));
 }
 
 std::string BuildRawHMACKey() {
   scoped_ptr<crypto::SymmetricKey> key(crypto::SymmetricKey::GenerateRandomKey(
       crypto::SymmetricKey::AES, kHMACKeySizeInBits));
   std::string raw_result, result;
   key->GetRawKey(&raw_result);
   base::Base64Encode(raw_result, &result);
   return result;
 }
@@ skipping 101 matching lines @@
                                               base64_signature_key);
     return true;
   }
   NOTREACHED();
   return false;
 }
 
 std::string SupervisedUserAuthentication::GenerateMasterKey() {
   char master_key_bytes[kMasterKeySize];
   crypto::RandBytes(&master_key_bytes, sizeof(master_key_bytes));
-  return base::StringToLowerASCII(
+  return base::ToLowerASCII(
       base::HexEncode(reinterpret_cast<const void*>(master_key_bytes),
                       sizeof(master_key_bytes)));
 }
 
 void SupervisedUserAuthentication::StorePasswordData(
     const std::string& user_id,
     const base::DictionaryValue& password_data) {
   base::DictionaryValue holder;
   owner_->GetPasswordInformation(user_id, &holder);
   const base::Value* value;
@@ skipping 139 matching lines @@
     LOG(FATAL) << "HMAC::Sign failed";
 
   std::string raw_result(out_bytes, out_bytes + sizeof(out_bytes));
 
   std::string result;
   base::Base64Encode(raw_result, &result);
   return result;
 }
 
 }  // namespace chromeos