replace wstring printf in geolocation as wstring is deprecated

content/browser/geolocation/wifi_data_provider_common.cc

Index: content/browser/geolocation/wifi_data_provider_common.cc
diff --git a/content/browser/geolocation/wifi_data_provider_common.cc b/content/browser/geolocation/wifi_data_provider_common.cc
index 7156d1256b4ec53f720a2c1b549a3ee5484ce05b..e20b5ee48efe3f4f5b776b7282cb1465a179f9ac 100644
--- a/content/browser/geolocation/wifi_data_provider_common.cc
+++ b/content/browser/geolocation/wifi_data_provider_common.cc
@@ -11,9 +11,9 @@
 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],