Replace ToLower calls to the new format

chrome/common/importer/firefox_importer_utils.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/common/importer/firefox_importer_utils.h"
 
 #include <algorithm>
 #include <map>
 #include <string>
 
@@ skipping 301 matching lines @@
           line.substr(name_attr.size()).CopyToString(&branding_name);
           break;
         } else if (line.length() > 0 && line[0] == '[') {
           // No longer in the [App] section.
           break;
         }
       }
     }
   }
 
-  base::StringToLowerASCII(&branding_name);
+  branding_name = base::ToLowerASCII(branding_name);
   if (branding_name.find("iceweasel") != std::string::npos)
     return l10n_util::GetStringUTF16(IDS_IMPORT_FROM_ICEWEASEL);
   return l10n_util::GetStringUTF16(IDS_IMPORT_FROM_FIREFOX);
 }