Replace ToLower calls to the new format

chrome/browser/extensions/api/music_manager_private/device_id.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 "chrome/browser/extensions/api/music_manager_private/device_id.h"
 
 #include "base/bind.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "crypto/hmac.h"
 
 namespace {
 
 using extensions::api::DeviceId;
 
 // Compute HMAC-SHA256(|key|, |text|) as a string.
 bool ComputeHmacSha256(const std::string& key,
                        const std::string& text,
                        std::string* signature_return) {
   crypto::HMAC hmac(crypto::HMAC::SHA256);
   const size_t digest_length = hmac.DigestLength();
   std::vector<uint8> digest(digest_length);
   bool result = hmac.Init(key) &&
       hmac.Sign(text, &digest[0], digest.size());
   if (result) {
-    *signature_return = base::StringToLowerASCII(
+    *signature_return = base::ToLowerASCII(
         base::HexEncode(digest.data(), digest.size()));
   }
   return result;
 }
 
 void GetRawDeviceIdCallback(const std::string& extension_id,
                             const DeviceId::IdCallback& callback,
                             const std::string& raw_device_id) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
@@ skipping 147 matching lines @@
   GetRawDeviceId(base::Bind(&GetRawDeviceIdCallback, extension_id, callback));
 }
 
 // static
 bool DeviceId::IsValidMacAddress(const void* bytes, size_t size) {
   return IsValidMacAddressImpl(bytes, size);
 }
 
 }  // namespace api
 }  // namespace extensions