Remove wchar/wstring version of StringPrintf.

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..d18b21d30cf76130997f0095e43c8be0f4b6f654 100644
--- a/content/browser/geolocation/wifi_data_provider_common.cc
+++ b/content/browser/geolocation/wifi_data_provider_common.cc
@@ -11,15 +11,15 @@
 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,
-                                        mac_as_int[0],
-                                        mac_as_int[1],
-                                        mac_as_int[2],
-                                        mac_as_int[3],
-                                        mac_as_int[4],
-                                        mac_as_int[5]));
+  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()