Convert JsonWriter::Write to taking a const ref for the in-param

chrome/browser/chromeos/file_manager/url_util.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/chromeos/file_manager/url_util.h"
 
 #include "base/json/json_writer.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/file_manager/app_id.h"
 #include "net/base/escape.h"
@@ skipping 93 matching lines @@
 
     arg_value.SetBoolean("includeAllFiles", file_types->include_all_files);
   }
 
   // If the caller cannot handle Drive path, the file chooser dialog need to
   // return resolved local native paths to the selected files.
   arg_value.SetBoolean("shouldReturnLocalPath",
                        !file_types || !file_types->support_drive);
 
   std::string json_args;
-  base::JSONWriter::Write(&arg_value, &json_args);
+  base::JSONWriter::Write(arg_value, &json_args);
 
   std::string url = GetFileManagerMainPageUrl().spec() + '?' +
       net::EscapeUrlEncodedData(json_args,
                                 false);  // Space to %20 instead of +.
   return GURL(url);
 }
 
 }  // namespace util
 }  // namespace file_manager