Fixed all unused-variable Clang warnings on Windows.

chrome/installer/util/language_selector.cc

 // Copyright (c) 2012 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.
 //
 // This file defines a helper class for selecting a supported language from a
 // set of candidates.
 
 #include "chrome/installer/util/language_selector.h"
 
 #include <algorithm>
@@ skipping 10 matching lines @@
 
 struct LangToOffset {
   const wchar_t* language;
   int offset;
 };
 
 // The language we fall back upon when all else fails.
 const wchar_t kFallbackLanguage[] = L"en-us";
 const int kFallbackLanguageOffset = IDS_L10N_OFFSET_EN_US;
 
-// http://tools.ietf.org/html/rfc5646 Section 2.3.3
-const std::wstring::size_type kScriptSubtagLength = 4;
-
 // A sorted array of language identifiers (and their offsets) for which
 // translations are available. The contents of the array are generated by
 // create_string_rc.py.
 const LangToOffset kLanguageOffsetPairs[] = {
 #define HANDLE_LANGUAGE(l_, o_) { L ## #l_, o_ },
   DO_LANGUAGES
 #undef HANDLE_LANGUAGE
 };
 
 // A sorted array of language identifiers that are aliases to other languages
@@ skipping 242 matching lines @@
     VLOG(1) << "No suitable language found for any candidates.";
 
     // Our fallback is "en-us"
     matched_candidate_.assign(&kFallbackLanguage[0],
                               arraysize(kFallbackLanguage) - 1);
     offset_ = kFallbackLanguageOffset;
   }
 }
 
 }  // namespace installer