Use base namespace for string16 in components and cloud_print.

components/wifi/wifi_service_win.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 "components/wifi/wifi_service.h"
 
 #include <iphlpapi.h>
 #include <objbase.h>
 #include <wlanapi.h>
 
@@ skipping 820 matching lines @@
     if (error == ERROR_SUCCESS) {
       error = ::IpRenewAddress(&adapter_index_map);
     }
   }
   return error;
 }
 
 DWORD WiFiServiceImpl::FindAdapterIndexMapByGUID(
     const GUID& interface_guid,
     IP_ADAPTER_INDEX_MAP* adapter_index_map) {
-  string16 guid_string;
+  base::string16 guid_string;
   const int kGUIDSize = 39;
   ::StringFromGUID2(
       interface_guid, WriteInto(&guid_string, kGUIDSize), kGUIDSize);
 
   ULONG buffer_length = 0;
   DWORD error = ::GetInterfaceInfo(NULL, &buffer_length);
   if (error == ERROR_INSUFFICIENT_BUFFER) {
     scoped_ptr<unsigned char[]> buffer(new unsigned char[buffer_length]);
     IP_INTERFACE_INFO* interface_info =
         reinterpret_cast<IP_INTERFACE_INFO*>(buffer.get());
@@ skipping 571 matching lines @@
     NetworkGuidList changed_networks(1, network_guid);
     message_loop_proxy_->PostTask(
         FROM_HERE,
         base::Bind(networks_changed_observer_, changed_networks));
   }
 }
 
 WiFiService* WiFiService::Create() { return new WiFiServiceImpl(); }
 
 }  // namespace wifi