[Hotword] Ok Google options disappear if search provider is changed from

chrome/browser/search/hotword_service.h

Index: chrome/browser/search/hotword_service.h
diff --git a/chrome/browser/search/hotword_service.h b/chrome/browser/search/hotword_service.h
index 3a99a4b3e9fd567fca27ba273e8b5e8616065ecd..87a18403e8bb69d401465cf126e08b24a9d86593 100644
--- a/chrome/browser/search/hotword_service.h
+++ b/chrome/browser/search/hotword_service.h
@@ -148,6 +148,9 @@ class HotwordService : public extensions::ExtensionRegistryObserver,
   // Sets the audio history handler. Used for tests.
   void SetAudioHistoryHandler(HotwordAudioHistoryHandler* handler);
 
+  // Turn off the currently enabled version of hotwording if one exists.
+  void DisableHotwordPreferences();
+
  private:
   class HotwordUserSessionStateObserver;