Replace the use of CLD_DATA_FROM* and CLD-related ifdefs with runtime checks.

components/translate/content/common/cld_data_source.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 COMPONENTS_TRANSLATE_CONTENT_COMMON_CLD_DATA_SOURCE_H_
 #define COMPONENTS_TRANSLATE_CONTENT_COMMON_CLD_DATA_SOURCE_H_
 
 #include <string>
 
 namespace translate {
 
 // Provides high-level functionality related to a CLD Data Source.
 class CldDataSource {
 
  public:
 
   // Returns the symbolic name of the data source. In the Chromium
   // open-source tree, the following data sources exist:
   // static       uses the static_[browser|renderer]_cld_data_provider
   //              implementations.
   // standalone   uses the data_file_[browser|renderer]_cld_data_provider
   //              implementations.
   // component    also uses the data_file_[browser|renderer]_cld_data_provider
   //              implementations.
   //
   // Other implementations based upon Chromium may provide CLD differently and
-  // may have other names.
+  // may have other names. This method is primarily provided for those
+  // non-Chromium implementations; Chromium implementations should use the
+  // boolean methods in this class instead:
+  // ShouldRegisterForComponentUpdates()
+  // ShouldUseStandaloneDataFile()
   static std::string GetName();
 
+  // Returns true if the data source needs to receive updates from the
+  // Component Updater.
+  // This is only true if the data source name is "component", but makes caller
+  // logic more generic.
+  static bool ShouldRegisterForComponentUpdates();
+
+  // Returns true if the data source needs to have the path to the CLD
+  // data file configured immediately because it is bundled with Chromium.
+  // This is only true if the data source name is "standalone", but makes
+  // caller logic more generic.
+  static bool ShouldUseStandaloneDataFile();
 };
 
 }  // namespace translate
 #endif  // COMPONENTS_TRANSLATE_CONTENT_COMMON_CLD_DATA_SOURCE_H_