replace wstring printf in geolocation as wstring is deprecated

content/browser/geolocation/wifi_data_provider_common.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 "content/browser/geolocation/wifi_data_provider_common.h"
 
 #include "base/bind.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 
 string16 MacAddressAsString16(const uint8 mac_as_int[6]) {
   // mac_as_int is big-endian. Write in byte chunks.
   // Format is XX-XX-XX-XX-XX-XX.
-  static const wchar_t* const kMacFormatString =
-      L"%02x-%02x-%02x-%02x-%02x-%02x";
-  return WideToUTF16(base::StringPrintf(kMacFormatString,
+  static const char* const kMacFormatString =
+      "%02x-%02x-%02x-%02x-%02x-%02x";
+  return ASCIIToUTF16(base::StringPrintf(kMacFormatString,
                                         mac_as_int[0],
                                         mac_as_int[1],
                                         mac_as_int[2],
                                         mac_as_int[3],
                                         mac_as_int[4],
                                         mac_as_int[5]));
 }
 
 WifiDataProviderCommon::WifiDataProviderCommon()
     : Thread("Geolocation_wifi_provider"),
@@ skipping 73 matching lines @@
   }
 }
 
 void WifiDataProviderCommon::ScheduleNextScan(int interval) {
   message_loop()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&WifiDataProviderCommon::DoWifiScanTask,
                  weak_factory_.GetWeakPtr()),
       base::TimeDelta::FromMilliseconds(interval));
 }