Revert "[dart:io] Adds Platform.localeName"

runtime/bin/platform_win.cc

Index: runtime/bin/platform_win.cc
diff --git a/runtime/bin/platform_win.cc b/runtime/bin/platform_win.cc
index 8ec32d24e1d9c23cf1d493f5dc3e2689692eab76..18526517e9ff2bd72c742d36a6a46bfdd3d30805 100644
--- a/runtime/bin/platform_win.cc
+++ b/runtime/bin/platform_win.cc
@@ -198,16 +198,6 @@ const char* Platform::LibraryExtension() {
 }
 
 
-const char* Platform::LocaleName() {
-  wchar_t locale_name[LOCALE_NAME_MAX_LENGTH];
-  int result = GetUserDefaultLocaleName(locale_name, LOCALE_NAME_MAX_LENGTH);
-  if (result == 0) {
-    return NULL;
-  }
-  return StringUtilsWin::WideToUtf8(locale_name);
-}
-
-
 bool Platform::LocalHostname(char* buffer, intptr_t buffer_length) {
 #if defined(DART_IO_DISABLED) || defined(PLATFORM_DISABLE_SOCKET)
   return false;