Language settings: Fix Restart and Remove buttons shown at wrong times

chrome/browser/ui/webui/settings/languages_handler.h

Index: chrome/browser/ui/webui/settings/languages_handler.h
diff --git a/chrome/browser/ui/webui/settings/languages_handler.h b/chrome/browser/ui/webui/settings/languages_handler.h
index d8ae17b8d028ec1ae9465248318eddea1a665e19..e1cfd55e98f5f80b67eceb9455b787fac1afbde9 100644
--- a/chrome/browser/ui/webui/settings/languages_handler.h
+++ b/chrome/browser/ui/webui/settings/languages_handler.h
@@ -32,8 +32,14 @@ class LanguagesHandler : public SettingsPageUIHandler {
   void OnJavascriptDisallowed() override {}
 
  private:
-  // Changes the UI language, provided the user is allowed to do so.
-  void HandleSetUILanguage(const base::ListValue* args);
+  // Returns the prospective UI language. May not match the actual UI language,
+  // depending on the user's permissions and whether the language is substituted
+  // for another locale.
+  void HandleGetProspectiveUILanguage(const base::ListValue* args);
+
+  // Changes the preferred UI language, provided the user is allowed to do so.
+  // The actual UI language will not change until the next restart.
+  void HandleSetProspectiveUILanguage(const base::ListValue* args);
 
   Profile* profile_;  // Weak pointer.