Implement "Add" and "Remove" buttons in Language and Input page.

chrome/browser/chromeos/dom_ui/language_options_handler.h

Index: chrome/browser/chromeos/dom_ui/language_options_handler.h
diff --git a/chrome/browser/chromeos/dom_ui/language_options_handler.h b/chrome/browser/chromeos/dom_ui/language_options_handler.h
index 5d8a02dc5cf29abd24753d57d30fe52bdd166125..102d3df1577cf8126d3fbf13a0f70345111fe224 100644
--- a/chrome/browser/chromeos/dom_ui/language_options_handler.h
+++ b/chrome/browser/chromeos/dom_ui/language_options_handler.h
@@ -24,6 +24,9 @@ class LanguageOptionsHandler : public OptionsPageUIHandler {
   // Get the list of input methods.
   ListValue* GetInputMethodList();
 
+  // Get the list of languages.
+  ListValue* GetLanguageList();
+
   DISALLOW_COPY_AND_ASSIGN(LanguageOptionsHandler);
 };