Revert of Move JoinString to the base namespace

components/autofill/core/common/password_form.cc

 // Copyright 2013 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 <ostream>
 #include <sstream>
 
 #include "base/json/json_writer.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
@@ skipping 18 matching lines @@
   target->SetString("username_elem", form.username_element);
   target->SetBoolean("username_marked_by_site", form.username_marked_by_site);
   target->SetString("username_value", form.username_value);
   target->SetString("password_elem", form.password_element);
   target->SetString("password_value", form.password_value);
   target->SetString("new_password_element", form.new_password_element);
   target->SetString("new_password_value", form.new_password_value);
   target->SetBoolean("new_password_marked_by_site",
                      form.new_password_marked_by_site);
   target->SetString("other_possible_usernames",
-                    base::JoinString(form.other_possible_usernames,
-                                     base::ASCIIToUTF16("|")));
+                    JoinString(form.other_possible_usernames, '|'));
   target->SetBoolean("blacklisted", form.blacklisted_by_user);
   target->SetBoolean("preferred", form.preferred);
   target->SetBoolean("ssl_valid", form.ssl_valid);
   target->SetDouble("date_created", form.date_created.ToDoubleT());
   target->SetDouble("date_synced", form.date_synced.ToDoubleT());
   target->SetInteger("type", form.type);
   target->SetInteger("times_used", form.times_used);
   std::ostringstream form_data_string_stream;
   form_data_string_stream << form.form_data;
   target->SetString("form_data", form_data_string_stream.str());
@@ skipping 115 matching lines @@
       form_json, base::JSONWriter::OPTIONS_PRETTY_PRINT, &form_as_string);
   base::TrimWhitespaceASCII(form_as_string, base::TRIM_ALL, &form_as_string);
   return os << "PasswordForm(" << form_as_string << ")";
 }
 
 std::ostream& operator<<(std::ostream& os, PasswordForm* form) {
   return os << "&" << *form;
 }
 
 }  // namespace autofill