Remove a deprecated wstring ToLower function.

chrome/browser/spellcheck_host.cc

 // Copyright (c) 2009 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/spellcheck_host.h"
 
 #include <fcntl.h>
 
 #include "app/l10n_util.h"
 #include "base/file_util.h"
@@ skipping 202 matching lines @@
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
 
   if (!request_context_getter_) {
     InitializeOnFileThread();
     return;
   }
 
   // Determine URL of file to download.
   static const char kDownloadServerUrl[] =
       "http://cache.pack.google.com/edgedl/chrome/dict/";
-  GURL url = GURL(std::string(kDownloadServerUrl) + WideToUTF8(
-      l10n_util::ToLower(bdict_file_path_.BaseName().ToWStringHack())));
+  GURL url = GURL(std::string(kDownloadServerUrl) +
+      StringToLowerASCII(WideToUTF8(
+          bdict_file_path_.BaseName().ToWStringHack())));
   fetcher_.reset(new URLFetcher(url, URLFetcher::GET, this));
   fetcher_->set_request_context(request_context_getter_);
   tried_to_download_ = true;
   fetcher_->Start();
   request_context_getter_ = NULL;
 }
 
 void SpellCheckHost::WriteWordToCustomDictionary(const std::string& word) {
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::FILE));
 
@@ skipping 62 matching lines @@
       ChromeThread::PostTask(ChromeThread::UI, FROM_HERE,
           NewRunnableMethod(this,
               &SpellCheckHost::InformObserverOfInitialization));
       return;
     }
   }
 
   data_.clear();
   Initialize();
 }