Replace ToLower calls to the new format

chromeos/login/auth/key.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 "chromeos/login/auth/key.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 66 matching lines @@
   switch (target_key_type) {
     case KEY_TYPE_SALTED_SHA256_TOP_HALF: {
       // TODO(stevenjb/nkostylev): Handle empty salt gracefully.
       CHECK(!salt.empty());
       char hash[crypto::kSHA256Length];
       crypto::SHA256HashString(salt + secret_, &hash, sizeof(hash));
 
       // Keep only the first half of the hash for 'weak' hashing so that the
       // plain text secret cannot be reconstructed even if the hashing is
       // reversed.
-      secret_ = base::StringToLowerASCII(base::HexEncode(
+      secret_ = base::ToLowerASCII(base::HexEncode(
           reinterpret_cast<const void*>(hash), sizeof(hash) / 2));
       break;
     }
     case KEY_TYPE_SALTED_PBKDF2_AES256_1234: {
       scoped_ptr<crypto::SymmetricKey> key(
           crypto::SymmetricKey::DeriveKeyFromPassword(crypto::SymmetricKey::AES,
                                                       secret_,
                                                       salt,
                                                       kNumIterations,
                                                       kKeySizeInBits));
@@ skipping 11 matching lines @@
       // hashed. If hashing fails, crash instead of sending a plain-text key.
       CHECK(false);
       return;
   }
 
   key_type_ = target_key_type;
   salt_ = salt;
 }
 
 }  // namespace chromeos