Replace ToLower calls to the new format

chrome/browser/spellchecker/spellcheck_hunspell_dictionary.cc

 // Copyright (c) 2012 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/spellchecker/spellcheck_hunspell_dictionary.h"
 
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
@@ skipping 210 matching lines @@
 }
 
 GURL SpellcheckHunspellDictionary::GetDictionaryURL() {
   static const char kDownloadServerUrl[] =
       "https://redirector.gvt1.com/edgedl/chrome/dict/";
   std::string bdict_file = dictionary_file_.path.BaseName().MaybeAsASCII();
 
   DCHECK(!bdict_file.empty());
 
   return GURL(std::string(kDownloadServerUrl) +
-              base::StringToLowerASCII(bdict_file));
+              base::ToLowerASCII(bdict_file));
 }
 
 void SpellcheckHunspellDictionary::DownloadDictionary(GURL url) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(request_context_getter_);
 
   download_status_ = DOWNLOAD_IN_PROGRESS;
   FOR_EACH_OBSERVER(Observer, observers_, OnHunspellDictionaryDownloadBegin());
 
   fetcher_ = net::URLFetcher::Create(url, net::URLFetcher::GET, this);
@@ skipping 117 matching lines @@
 void SpellcheckHunspellDictionary::InformListenersOfInitialization() {
   FOR_EACH_OBSERVER(Observer, observers_, OnHunspellDictionaryInitialized());
 }
 
 void SpellcheckHunspellDictionary::InformListenersOfDownloadFailure() {
   download_status_ = DOWNLOAD_FAILED;
   FOR_EACH_OBSERVER(Observer,
                     observers_,
                     OnHunspellDictionaryDownloadFailure());
 }