Move language detection to a component

chrome/common/chrome_constants.h

 // 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.
 
 // A handful of resource-like constants related to the Chrome application.
 
 #ifndef CHROME_COMMON_CHROME_CONSTANTS_H_
 #define CHROME_COMMON_CHROME_CONSTANTS_H_
 
 #include "base/files/file_path.h"
@@ skipping 74 matching lines @@
 extern const base::FilePath::CharType kWebAppDirname[];
 
 // File name of the Pepper Flash plugin on different platforms.
 extern const base::FilePath::CharType kPepperFlashPluginFilename[];
 
 // directory names
 extern const wchar_t kUserDataDirname[];
 
 extern const bool kRecordModeEnabled;
 
-// The language code used when the language of a page could not be detected.
-// (Matches what the CLD -Compact Language Detection- library reports.)
-extern const char* const kUnknownLanguageCode;
-
 // If a WebContents is impolite and displays a second JavaScript alert within
 // kJavaScriptMessageExpectedDelay of a previous JavaScript alert being
 // dismissed, display an option to suppress future alerts from this WebContents.
 extern const int kJavaScriptMessageExpectedDelay;
 
 // Are touch icons enabled? False by default.
 extern const bool kEnableTouchIcon;
 
 // Fraction of the total number of processes to be used for hosting
 // extensions. If we have more extensions than this percentage, we will start
@@ skipping 41 matching lines @@
 // This must be kept in sync with TestingProfile::kTestUserProfileDir.
 extern const char kTestUserProfileDir[];
 #endif
 
 // Used to identify the application to the system AV function in Windows.
 extern const char kApplicationClientIDStringForAVScanning[];
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_CHROME_CONSTANTS_H_