Convert remaining StringToLowerASCII to ToLowerASCII

ppapi/proxy/file_chooser_resource.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 "ppapi/proxy/file_chooser_resource.h"
 
 #include "base/bind.h"
 #include "base/strings/string_split.h"
 #include "ipc/ipc_message.h"
 #include "ppapi/c/pp_errors.h"
@@ skipping 75 matching lines @@
     std::string type = type_list[i];
     base::TrimWhitespaceASCII(type, base::TRIM_ALL, &type);
 
     // If the type is a single character, it definitely cannot be valid. In the
     // case of a file extension it would be a single ".". In the case of a MIME
     // type it would just be a "/".
     if (type.length() < 2)
       continue;
     if (type.find_first_of('/') == std::string::npos && type[0] != '.')
       continue;
-    base::StringToLowerASCII(&type);
-    output->push_back(type);
+    output->push_back(base::ToLowerASCII(type));
   }
 }
 
 void FileChooserResource::OnPluginMsgShowReply(
     const ResourceMessageReplyParams& params,
     const std::vector<FileRefCreateInfo>& chosen_files) {
   if (output_.is_valid()) {
     // Using v0.6 of the API with the output array.
     std::vector<PP_Resource> files;
     for (size_t i = 0; i < chosen_files.size(); i++) {
@@ skipping 38 matching lines @@
         mode_ == PP_FILECHOOSERMODE_OPENMULTIPLE,
         sugg_str ? sugg_str->value() : std::string(),
         accept_types_);
   Call<PpapiPluginMsg_FileChooser_ShowReply>(RENDERER, msg,
       base::Bind(&FileChooserResource::OnPluginMsgShowReply, this));
   return PP_OK_COMPLETIONPENDING;
 }
 
 }  // namespace proxy
 }  // namespace ppapi