Use proper pair type in range-based for map iterations.

chrome/browser/supervised_user/supervised_user_url_filter.cc

Index: chrome/browser/supervised_user/supervised_user_url_filter.cc
diff --git a/chrome/browser/supervised_user/supervised_user_url_filter.cc b/chrome/browser/supervised_user/supervised_user_url_filter.cc
index d85a5dfbf2be65da0f39f8c3b54e26e010c017e5..26d68c2798391dfac90bb714a9596033cf160c5a 100644
--- a/chrome/browser/supervised_user/supervised_user_url_filter.cc
+++ b/chrome/browser/supervised_user/supervised_user_url_filter.cc
@@ -315,7 +315,7 @@ SupervisedUserURLFilter::GetFilteringBehaviorForURL(
 
   // Look for patterns matching the hostname, with a value that is different
   // from the default (a value of true in the map meaning allowed).
-  for (const std::pair<std::string, bool>& host_entry : host_map_) {
+  for (const auto& host_entry : host_map_) {
     if ((host_entry.second == (default_behavior_ == BLOCK)) &&
         HostMatchesPattern(host, host_entry.first)) {
       return host_entry.second ? ALLOW : BLOCK;