Add a new CldDataSource class that can be queried at runtime.

components/translate/content/common/standalone_cld_data_source.cc

Index: components/translate/content/common/standalone_cld_data_source.cc
diff --git a/components/translate/core/common/translate_constants.cc b/components/translate/content/common/standalone_cld_data_source.cc
similarity index 65%
copy from components/translate/core/common/translate_constants.cc
copy to components/translate/content/common/standalone_cld_data_source.cc
index 7b2034e5ad164ac450f67f379497929733191ab5..1e715c348e3717c5102a47de860ba1c6270f8017 100644
--- a/components/translate/core/common/translate_constants.cc
+++ b/components/translate/content/common/standalone_cld_data_source.cc
@@ -2,10 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/translate/core/common/translate_constants.h"
+#include "cld_data_source.h"
 
 namespace translate {
 
-const char* const kUnknownLanguageCode = "und";
+  std::string CldDataSource::GetName() {
+    return "standalone";
+  }
 
 }  // namespace translate