Implement (FORMAT_ELAPSED, LENGTH_LONG) in time_format

ui/base/l10n/time_format.h

Index: ui/base/l10n/time_format.h
diff --git a/ui/base/l10n/time_format.h b/ui/base/l10n/time_format.h
index 9fda463c9e2c8a067d84e6a2040cfceaa231c7e2..16dda77e76e327dba58fa3d70bc681bf145cc200 100644
--- a/ui/base/l10n/time_format.h
+++ b/ui/base/l10n/time_format.h
@@ -34,8 +34,7 @@ class UI_BASE_EXPORT TimeFormat {
 
   // Return a localized string of approximate time duration, formatted as a
   // single number, e.g. in English "2 hours ago".  Currently, all combinations
-  // of format and length except (FORMAT_ELAPSED, LENGTH_LONG) are implemented
-  // but it's easy to add this, if required.
+  // of format and length are implemented.
   static base::string16 Simple(Format format,
                                Length length,
                                const base::TimeDelta& delta);