Update from https://crrev.com/329939

base/i18n/icu_string_conversions.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_I18N_ICU_STRING_CONVERSIONS_H_
 #define BASE_I18N_ICU_STRING_CONVERSIONS_H_
 
 #include <string>
 
 #include "base/i18n/base_i18n_export.h"
 #include "base/i18n/i18n_constants.h"
 #include "base/strings/string16.h"
 
 namespace base {
 
-// Defines the error handling modes of UTF16ToCodepage, CodepageToUTF16,
-// WideToCodepage and CodepageToWide.
+// Defines the error handling modes of UTF16ToCodepage and CodepageToUTF16.
 class OnStringConversionError {
  public:
   enum Type {
     // The function will return failure. The output buffer will be empty.
     FAIL,
 
     // The offending characters are skipped and the conversion will proceed as
     // if they did not exist.
     SKIP,
 
@@ skipping 12 matching lines @@
 // returns false.
 BASE_I18N_EXPORT bool UTF16ToCodepage(const string16& utf16,
                                       const char* codepage_name,
                                       OnStringConversionError::Type on_error,
                                       std::string* encoded);
 BASE_I18N_EXPORT bool CodepageToUTF16(const std::string& encoded,
                                       const char* codepage_name,
                                       OnStringConversionError::Type on_error,
                                       string16* utf16);
 
-// Converts between wide strings and the encoding specified.  If the
-// encoding doesn't exist or the encoding fails (when on_error is FAIL),
-// returns false.
-BASE_I18N_EXPORT bool WideToCodepage(const std::wstring& wide,
-                                     const char* codepage_name,
-                                     OnStringConversionError::Type on_error,
-                                     std::string* encoded);
-BASE_I18N_EXPORT bool CodepageToWide(const std::string& encoded,
-                                     const char* codepage_name,
-                                     OnStringConversionError::Type on_error,
-                                     std::wstring* wide);
-
 // Converts from any codepage to UTF-8 and ensures the resulting UTF-8 is
 // normalized.
 BASE_I18N_EXPORT bool ConvertToUtf8AndNormalize(const std::string& text,
                                                 const std::string& charset,
                                                 std::string* result);
 
 }  // namespace base
 
 #endif  // BASE_I18N_ICU_STRING_CONVERSIONS_H_