Switch ObserverList::size() to ObserverList::might_have_observers() Pt.1

net/dns/mdns_client_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/dns/mdns_client_impl.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/stl_util.h"
 #include "base/time/default_clock.h"
@@ skipping 360 matching lines @@
 void MDnsClientImpl::Core::RemoveListener(MDnsListenerImpl* listener) {
   ListenerKey key(listener->GetName(), listener->GetType());
   ListenerMap::iterator observer_list_iterator = listeners_.find(key);
 
   DCHECK(observer_list_iterator != listeners_.end());
   DCHECK(observer_list_iterator->second->HasObserver(listener));
 
   observer_list_iterator->second->RemoveObserver(listener);
 
   // Remove the observer list from the map if it is empty
-  if (observer_list_iterator->second->size() == 0) {
+  if (!observer_list_iterator->second->might_have_observers()) {
     // Schedule the actual removal for later in case the listener removal
     // happens while iterating over the observer list.
     base::MessageLoop::current()->PostTask(
         FROM_HERE, base::Bind(
             &MDnsClientImpl::Core::CleanupObserverList, AsWeakPtr(), key));
   }
 }
 
 void MDnsClientImpl::Core::CleanupObserverList(const ListenerKey& key) {
   ListenerMap::iterator found = listeners_.find(key);
-  if (found != listeners_.end() && found->second->size() == 0) {
+  if (found != listeners_.end() && !found->second->might_have_observers()) {
     delete found->second;
     listeners_.erase(found);
   }
 }
 
 void MDnsClientImpl::Core::ScheduleCleanup(base::Time cleanup) {
   // Cleanup is already scheduled, no need to do anything.
   if (cleanup == scheduled_cleanup_) return;
   scheduled_cleanup_ = cleanup;
 
@@ skipping 259 matching lines @@
 
 void MDnsTransactionImpl::OnNsecRecord(const std::string& name, unsigned type) {
   TriggerCallback(RESULT_NSEC, NULL);
 }
 
 void MDnsTransactionImpl::OnCachePurged() {
   // TODO(noamsml): Cache purge situations not yet implemented
 }
 
 }  // namespace net