Refactor language detection logic to allow non-static CLD data sources.

chrome/browser/component_updater/cld_component_installer.h

 // Copyright 2014 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 CHROME_BROWSER_COMPONENT_UPDATER_CLD_COMPONENT_INSTALLER_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_CLD_COMPONENT_INSTALLER_H_
 
 #include <stdint.h>
 #include <string>
 #include <vector>
@@ skipping 50 matching lines @@
   // This method is threadsafe.
   static void SetLatestCldDataFile(const base::FilePath& path);
 
   // Returns the file path that was most recently set in SetLatestCldDataFile.
   static base::FilePath GetLatestCldDataFile();
 
   DISALLOW_COPY_AND_ASSIGN(CldComponentInstallerTraits);
 };
 
 // Call once during startup to make the component update service aware of
-// the CLD component.
+// the CLD component. This method does nothing if the configured CLD data source
+// is not the "Component" data source.
 void RegisterCldComponent(ComponentUpdateService* cus);
 
 }  // namespace component_updater
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_CLD_COMPONENT_INSTALLER_H_