Move StringToLowerASCII to base namespace

ash/system/chromeos/network/network_connect.cc

 // Copyright (c) 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 "ash/system/chromeos/network/network_connect.h"
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/system/chromeos/network/network_state_notifier.h"
 #include "ash/system/system_notifier.h"
@@ skipping 549 matching lines @@
   }
   if (error == shill::kErrorEapRemoteTlsFailed) {
     return l10n_util::GetStringUTF16(
         IDS_CHROMEOS_NETWORK_ERROR_EAP_REMOTE_TLS_FAILED);
   }
   if (error == shill::kErrorPppAuthFailed) {
     return l10n_util::GetStringUTF16(
         IDS_CHROMEOS_NETWORK_ERROR_PPP_AUTH_FAILED);
   }
 
-  if (StringToLowerASCII(error) ==
-      StringToLowerASCII(std::string(shill::kUnknownString))) {
+  if (base::StringToLowerASCII(error) ==
+      base::StringToLowerASCII(std::string(shill::kUnknownString))) {
     return l10n_util::GetStringUTF16(IDS_CHROMEOS_NETWORK_ERROR_UNKNOWN);
   }
   return l10n_util::GetStringFUTF16(IDS_NETWORK_UNRECOGNIZED_ERROR,
                                     base::UTF8ToUTF16(error));
 }
 
 void ShowNetworkSettings(const std::string& service_path) {
   if (!ash::Shell::HasInstance())
     return;
   ash::Shell::GetInstance()->system_tray_delegate()->ShowNetworkSettings(
       service_path);
 }
 
 }  // network_connect
 }  // ash