Replace ToLower calls to the new format

chrome/browser/extensions/external_registry_loader_win.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/extensions/external_registry_loader_win.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_file.h"
@@ skipping 80 matching lines @@
     if (key.Open(HKEY_LOCAL_MACHINE,
                  key_path.c_str(),
                  KEY_READ | KEY_WOW64_32KEY) != ERROR_SUCCESS &&
         key.Open(HKEY_CURRENT_USER, key_path.c_str(), KEY_READ) !=
             ERROR_SUCCESS) {
       LOG(ERROR) << "Unable to read registry key at path (HKLM & HKCU): "
                  << key_path << ".";
       continue;
     }
 
-    std::string id = base::UTF16ToASCII(*it);
-    base::StringToLowerASCII(&id);
+    std::string id = base::ToLowerASCII(base::UTF16ToASCII(*it));
     if (!crx_file::id_util::IdIsValid(id)) {
       LOG(ERROR) << "Invalid id value " << id
                  << " for key " << key_path << ".";
       continue;
     }
 
     base::string16 extension_dist_id;
     if (key.ReadValue(kRegistryExtensionInstallParam, &extension_dist_id) ==
         ERROR_SUCCESS) {
       prefs->SetString(MakePrefName(id, ExternalProviderImpl::kInstallParam),
@@ skipping 72 matching lines @@
 
   prefs_.reset(prefs.release());
   LOCAL_HISTOGRAM_TIMES("Extensions.ExternalRegistryLoaderWin",
                         base::TimeTicks::Now() - start_time);
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&ExternalRegistryLoader::LoadFinished, this));
 }
 
 }  // namespace extensions