Revert of Move JoinString to the base namespace

chromeos/network/network_change_notifier_chromeos.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 <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/strings/string_util.h"
@@ skipping 193 matching lines @@
                            "NCNDefaultIPAddressChanged",
                            is_suppressed ? " (Suppressed)" : "" ),
         base::StringPrintf("%s -> %s",
                            ip_address_.c_str(),
                            default_network->ip_address().c_str()));
   }
   if (default_network->dns_servers() != dns_servers_) {
     NET_LOG_EVENT(
         "NCNDefaultDNSServerChanged",
         base::StringPrintf(
-            "%s -> %s", base::JoinString(dns_servers_, ",").c_str(),
-            base::JoinString(default_network->dns_servers(), ",").c_str()));
+            "%s -> %s",
+            JoinString(dns_servers_, ",").c_str(),
+            JoinString(default_network->dns_servers(), ",").c_str()));
     *dns_changed = true;
   }
 
   connection_type_ = new_connection_type;
   service_path_ = default_network->path();
   ip_address_ = default_network->ip_address();
   dns_servers_ = default_network->dns_servers();
   double old_max_bandwidth = max_bandwidth_mbps_;
   max_bandwidth_mbps_ =
       GetMaxBandwidthForConnectionSubtype(GetConnectionSubtype(
@@ skipping 73 matching lines @@
   // produce a single signal when switching between network connections.
   params.ip_address_offline_delay_ = base::TimeDelta::FromMilliseconds(4000);
   params.ip_address_online_delay_ = base::TimeDelta::FromMilliseconds(1000);
   params.connection_type_offline_delay_ =
       base::TimeDelta::FromMilliseconds(500);
   params.connection_type_online_delay_ = base::TimeDelta::FromMilliseconds(500);
   return params;
 }
 
 }  // namespace chromeos