Move language_detection to core

components/translate/language_detection/language_detection_util.h

-// Copyright 2013 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 COMPONENTS_TRANSLATE_LANGUAGE_DETECTION_LANGUAGE_DETECTION_UTIL_H_
-#define COMPONENTS_TRANSLATE_LANGUAGE_DETECTION_LANGUAGE_DETECTION_UTIL_H_
-
-#include <string>
-
-#include "base/strings/string16.h"
-
-namespace translate {
-
-// Determines content page language from Content-Language code and contents.
-std::string DeterminePageLanguage(const std::string& code,
-                                  const std::string& html_lang,
-                                  const base::string16& contents,
-                                  std::string* cld_language,
-                                  bool* is_cld_reliable);
-
-// Corrects language code if it contains well-known mistakes.
-// Called only by tests.
-void CorrectLanguageCodeTypo(std::string* code);
-
-// Checks if the language code's format is valid.
-// Called only by tests.
-bool IsValidLanguageCode(const std::string& code);
-
-// Checks if languages are matched, or similar. This function returns true
-// against a language pair containing a language which is difficult for CLD to
-// distinguish.
-// Called only by tests.
-bool IsSameOrSimilarLanguages(const std::string& page_language,
-                              const std::string& cld_language);
-
-// Checks if languages pair is one of well-known pairs of wrong server
-// configuration.
-// Called only by tests.
-bool MaybeServerWrongConfiguration(const std::string& page_language,
-                                   const std::string& cld_language);
-
-}  // namespace translate
-
-#endif  // COMPONENTS_TRANSLATE_LANGUAGE_DETECTION_LANGUAGE_DETECTION_UTIL_H_