The UI language rather than the locale is now used to pick Chrome's language ...

base/i18n/rtl.h

 // Copyright (c) 2010 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_RTL_H_
 #define BASE_I18N_RTL_H_
 #pragma once
 
+#include <string>
+
 #include "base/compiler_specific.h"
 #include "base/string16.h"
 #include "build/build_config.h"
 
 class FilePath;
 
 namespace base {
 namespace i18n {
 
 const char16 kRightToLeftMark = 0x200F;
 const char16 kLeftToRightMark = 0x200E;
 const char16 kLeftToRightEmbeddingMark = 0x202A;
 const char16 kRightToLeftEmbeddingMark = 0x202B;
 const char16 kPopDirectionalFormatting = 0x202C;
 const char16 kLeftToRightOverride = 0x202D;
 const char16 kRightToLeftOverride = 0x202E;
 
 enum TextDirection {
   UNKNOWN_DIRECTION,
   RIGHT_TO_LEFT,
   LEFT_TO_RIGHT,
 };
 
-#if defined(OS_WIN)
-// Get language and region from the OS. Used by Chrome Frame.
-void GetLanguageAndRegionFromOS(std::string* lang, std::string* region);
-#endif
-
 // Get the locale that the currently running process has been configured to use.
 // The return value is of the form language[-country] (e.g., en-US) where the
 // language is the 2 or 3 letter code from ISO-639.
 std::string GetConfiguredLocale();
 
 // Canonicalize a string (eg. a POSIX locale string) to a Chrome locale name.
 std::string GetCanonicalLocale(const char* locale);
 
 // Sets the default locale of ICU.
 // Once the application locale of Chrome in GetApplicationLocale is determined,
@@ skipping 107 matching lines @@
 // return the text itself. Explicit bidi control characters display and have
 // semantic effect. They can be deleted so they might not always appear in a
 // pair.
 const string16 StripWrappingBidiControlCharacters(const string16& text)
     WARN_UNUSED_RESULT;
 
 }  // namespace i18n
 }  // namespace base
 
 #endif  // BASE_I18N_RTL_H_