Revert "By default use current code page on Windows for decoding string"

runtime/bin/io_natives.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/io_natives.h"
 
 #include <stdlib.h>
 #include <string.h>
 
 #include "bin/builtin.h"
@@ skipping 29 matching lines @@
   V(Socket_GetError, 1)                                                        \
   V(Socket_GetStdioHandle, 2)                                                  \
   V(Socket_NewServicePort, 0)                                                  \
   V(SecureSocket_Connect, 5)                                                   \
   V(SecureSocket_Destroy, 1)                                                   \
   V(SecureSocket_Handshake, 1)                                                 \
   V(SecureSocket_Init, 1)                                                      \
   V(SecureSocket_ProcessBuffer, 2)                                             \
   V(SecureSocket_RegisterBadCertificateCallback, 2)                            \
   V(SecureSocket_RegisterHandshakeCompleteCallback, 2)                         \
-  V(SecureSocket_InitializeLibrary, 3)                                         \
-  V(SystemEncodingToString, 1)                                                 \
-  V(StringToSystemEncoding, 1)
-
+  V(SecureSocket_InitializeLibrary, 3)
 
 IO_NATIVE_LIST(DECLARE_FUNCTION);
 
 static struct NativeEntries {
   const char* name_;
   Dart_NativeFunction function_;
   int argument_count_;
 } IOEntries[] = {
   IO_NATIVE_LIST(REGISTER_FUNCTION)
 };
 
 
 Dart_NativeFunction IONativeLookup(Dart_Handle name,
                                    int argument_count) {
   const char* function_name = NULL;
   Dart_Handle result = Dart_StringToCString(name, &function_name);
   DART_CHECK_VALID(result);
   ASSERT(function_name != NULL);
   int num_entries = sizeof(IOEntries) / sizeof(struct NativeEntries);
   for (int i = 0; i < num_entries; i++) {
     struct NativeEntries* entry = &(IOEntries[i]);
     if (!strcmp(function_name, entry->name_) &&
         (entry->argument_count_ == argument_count)) {
       return reinterpret_cast<Dart_NativeFunction>(entry->function_);
     }
   }
   return NULL;
 }