clang/win: Fix most -Wunused-function warnings in Chromium code.

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 106 matching lines @@
             false)) << "kLanguageToOffsetWildcards is not sorted";
 }
 #endif  // !defined(NDEBUG)
 
 // A less-than overload to do slightly more efficient searches in the
 // sorted arrays.
 bool operator<(const LangToOffset& left, const std::wstring& right) {
   return left.language < right;
 }
 
-// A less-than overload to do slightly more efficient searches in the
-// sorted arrays.
-bool operator<(const std::wstring& left, const LangToOffset& right) {
-  return left < right.language;
-}
-
-// A not-so-efficient less-than overload for the same uses as above.
-bool operator<(const LangToOffset& left, const LangToOffset& right) {
-  return std::wstring(left.language) < right.language;
-}
-
 // A compare function for searching in a sorted array by offset.
 bool IsOffsetLessThan(const LangToOffset& left, const LangToOffset& right) {
   return left.offset < right.offset;
 }
 
 // Binary search in one of the sorted arrays to find the offset corresponding to
 // a given language |name|.
 bool TryFindOffset(const LangToOffset* first, const LangToOffset* last,
                    const std::wstring& name, int* offset) {
   const LangToOffset* search_result = std::lower_bound(first, last, name);
@@ skipping 135 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