Added VLOG(1) loggings to mdns extensions API code

chrome/browser/extensions/api/mdns/mdns_api.cc

Index: chrome/browser/extensions/api/mdns/mdns_api.cc
diff --git a/chrome/browser/extensions/api/mdns/mdns_api.cc b/chrome/browser/extensions/api/mdns/mdns_api.cc
index 3e30670324c763e66641baa42387f333a1003f8a..4353561e883c25d6eb049d799cd707d6af271878 100644
--- a/chrome/browser/extensions/api/mdns/mdns_api.cc
+++ b/chrome/browser/extensions/api/mdns/mdns_api.cc
@@ -89,9 +89,6 @@ void MDnsAPI::UpdateMDnsListeners(const EventListenerInfo& details) {
   for (EventListenerMap::ListenerList::const_iterator it = listeners.begin();
        it != listeners.end(); ++it) {
     base::DictionaryValue* filter = ((*it)->filter.get());
-    for (base::DictionaryValue::Iterator iter(*filter);
-       !iter.IsAtEnd(); iter.Advance()) {
-    }
 
     std::string filter_value;
     filter->GetStringASCII(kEventFilterServiceTypeKey, &filter_value);
@@ -146,6 +143,8 @@ void MDnsAPI::OnDnsSdEvent(const std::string& service_type,
   event->restrict_to_browser_context = profile_;
   event->filter_info.SetServiceType(service_type);
 
+  VLOG(1) << "Broadcasting OnServiceList event: " << event.get();
+
   // TODO(justinlin): To avoid having listeners without filters getting all
   // events, modify API to have this event require filters.
   extensions::ExtensionSystem::Get(profile_)->event_router()->