Revert of Move JoinString to the base namespace

chrome/common/extensions/permissions/chrome_permission_message_rules.cc

 // Copyright 2014 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/extensions/permissions/chrome_permission_message_rules.h"
 
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
-#include "base/strings/utf_string_conversions.h"
 #include "chrome/grit/generated_resources.h"
 #include "extensions/common/permissions/api_permission_set.h"
 #include "extensions/common/permissions/coalesced_permission_message.h"
 #include "grit/extensions_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace extensions {
 
 namespace {
 
@@ skipping 72 matching lines @@
                               int message_id_for_multiple_hosts)
       : message_id_for_one_host_(message_id_for_one_host),
         message_id_for_multiple_hosts_(message_id_for_multiple_hosts) {}
   ~SpaceSeparatedListFormatter() override {}
 
   CoalescedPermissionMessage GetPermissionMessage(
       PermissionIDSet permissions) const override {
     DCHECK(permissions.size() > 0);
     std::vector<base::string16> hostnames =
         permissions.GetAllPermissionParameters();
-    base::string16 hosts_string =
-        base::JoinString(hostnames, base::ASCIIToUTF16(" "));
+    base::string16 hosts_string = JoinString(
+        std::vector<base::string16>(hostnames.begin(), hostnames.end()), ' ');
     return CoalescedPermissionMessage(
         l10n_util::GetStringFUTF16(hostnames.size() == 1
                                        ? message_id_for_one_host_
                                        : message_id_for_multiple_hosts_,
                                    hosts_string),
         permissions);
   }
 
  private:
   int message_id_for_one_host_;
@@ skipping 558 matching lines @@
   insert(permission_four);
   insert(permission_five);
   insert(permission_six);
 }
 
 ChromePermissionMessageRule::PermissionIDSetInitializer::
     ~PermissionIDSetInitializer() {
 }
 
 }  // namespace extensions