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

runtime/bin/platform.cc

Index: runtime/bin/platform.cc
diff --git a/runtime/bin/platform.cc b/runtime/bin/platform.cc
index bfe107fc1a6068db0c698b153ee33fce9edd7016..e8b7849147fff3ce403f356381af03ea9930b864 100644
--- a/runtime/bin/platform.cc
+++ b/runtime/bin/platform.cc
@@ -109,16 +109,6 @@ void FUNCTION_NAME(Platform_GetVersion)(Dart_NativeArguments args) {
   Dart_SetReturnValue(args, Dart_NewStringFromCString(Dart_VersionString()));
 }
 
-
-void FUNCTION_NAME(Platform_LocaleName)(Dart_NativeArguments args) {
-  const char* locale = Platform::LocaleName();
-  if (locale == NULL) {
-    Dart_SetReturnValue(args, DartUtils::NewDartOSError());
-  } else {
-    Dart_SetReturnValue(args, Dart_NewStringFromCString(locale));
-  }
-}
-
 }  // namespace bin
 }  // namespace dart