Replace string16 with base::string16.

chrome/browser/chromeos/login/helper.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/login/helper.h"
 
 #include "ash/shell.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chromeos/network/network_handler.h"
 #include "chromeos/network/network_state.h"
@@ skipping 43 matching lines @@
       return l10n_util::GetStringUTF16(IDS_STATUSBAR_NETWORK_DEVICE_ETHERNET);
     return UTF8ToUTF16(network->name());
   }
 
   network = nsh->ConnectingNetworkByType(NetworkTypePattern::NonVirtual());
   if (network) {
     if (network->Matches(NetworkTypePattern::Ethernet()))
       return l10n_util::GetStringUTF16(IDS_STATUSBAR_NETWORK_DEVICE_ETHERNET);
     return UTF8ToUTF16(network->name());
   }
-  return string16();
+  return base::string16();
 }
 
 bool NetworkStateHelper::IsConnected() const {
   chromeos::NetworkStateHandler* nsh =
       chromeos::NetworkHandler::Get()->network_state_handler();
   return nsh->ConnectedNetworkByType(chromeos::NetworkTypePattern::Default()) !=
          NULL;
 }
 
 bool NetworkStateHelper::IsConnecting() const {
   chromeos::NetworkStateHandler* nsh =
       chromeos::NetworkHandler::Get()->network_state_handler();
   return nsh->ConnectingNetworkByType(
       chromeos::NetworkTypePattern::Default()) != NULL;
 }
 
 }  // namespace login
 
 }  // namespace chromeos