Add unit test for Site Settings Handler.

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

Index: chrome/browser/ui/webui/settings/site_settings_handler.h
diff --git a/chrome/browser/ui/webui/settings/site_settings_handler.h b/chrome/browser/ui/webui/settings/site_settings_handler.h
index b70285d2ed06acbb802d9b067bdcf35f75894739..92d74e965b40c82dbc932e828557297ab3e86eaa 100644
--- a/chrome/browser/ui/webui/settings/site_settings_handler.h
+++ b/chrome/browser/ui/webui/settings/site_settings_handler.h
@@ -40,6 +40,9 @@ class SiteSettingsHandler : public SettingsPageUIHandler,
                                ContentSettingsType content_type,
                                std::string resource_identifier) override;
  private:
+  FRIEND_TEST_ALL_PREFIXES(SiteSettingsHandlerTest, GetAndSetDefault);
+  FRIEND_TEST_ALL_PREFIXES(SiteSettingsHandlerTest, Origins);
+
   // Asynchronously fetches the usage for a given origin. Replies back with
   // OnGetUsageInfo above.
   void HandleFetchUsageTotal(const base::ListValue* args);