Replace some hard coded schemes with the constants in /url/url_constants.h.

content/renderer/savable_resources.cc

Index: content/renderer/savable_resources.cc
diff --git a/content/renderer/savable_resources.cc b/content/renderer/savable_resources.cc
index 8ec18d76c241ded79392d42de7e127d567235fe4..958003f8783b7a8b321cd355b1255185a1f0eacf 100644
--- a/content/renderer/savable_resources.cc
+++ b/content/renderer/savable_resources.cc
@@ -90,7 +90,7 @@ void GetSavableResourceLinkForElement(
   // Ignore those URLs which are not standard protocols. Because FTP
   // protocol does no have cache mechanism, we will skip all
   // sub-resources if they use FTP protocol.
-  if (!u.SchemeIsHTTPOrHTTPS() && !u.SchemeIs("file"))
+  if (!u.SchemeIsHTTPOrHTTPS() && !u.SchemeIs(url::kFileScheme))
     return;
   // Ignore duplicated resource link.
   if (!unique_check->resources_set->insert(u).second)