Reduce buggy usage of the registry controlled domain service.

chrome/browser/supervised_user/supervised_user_url_filter.h

Index: chrome/browser/supervised_user/supervised_user_url_filter.h
diff --git a/chrome/browser/supervised_user/supervised_user_url_filter.h b/chrome/browser/supervised_user/supervised_user_url_filter.h
index 8bfdd89cfe5ed52fe384a3ecee92dfc894fc3c05..cc9c6ea986291d43ee07f68033073360cca916ab 100644
--- a/chrome/browser/supervised_user/supervised_user_url_filter.h
+++ b/chrome/browser/supervised_user/supervised_user_url_filter.h
@@ -103,7 +103,7 @@ class SupervisedUserURLFilter
   // Asterisks in other parts of the pattern are not allowed.
   // |host| and |pattern| are assumed to be normalized to lower-case.
   // This method is public for testing.
-  static bool HostMatchesPattern(const std::string& host,
+  static bool HostMatchesPattern(const std::string& canonical_host,
                                  const std::string& pattern);
 
   // Returns the filtering behavior for a given URL, based on the default