Simpler return value of HashTable::add/HashMap:add and others

Source/core/dom/IdTargetObserverRegistry.cpp

 /*
  * Copyright (C) 2012 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 24 matching lines @@
     return adoptPtr(new IdTargetObserverRegistry());
 }
 
 void IdTargetObserverRegistry::addObserver(const AtomicString& id, IdTargetObserver* observer)
 {
     if (id.isEmpty())
         return;
 
     IdToObserverSetMap::AddResult result = m_registry.add(id.impl(), nullptr);
     if (result.isNewEntry)
-        result.iterator->value = adoptPtr(new ObserverSet());
+        result.storedValue->value = adoptPtr(new ObserverSet());
 
-    result.iterator->value->add(observer);
+    result.storedValue->value->add(observer);
 }
 
 void IdTargetObserverRegistry::removeObserver(const AtomicString& id, IdTargetObserver* observer)
 {
     if (id.isEmpty() || m_registry.isEmpty())
         return;
 
     IdToObserverSetMap::iterator iter = m_registry.find(id.impl());
 
     ObserverSet* set = iter->value.get();
@@ skipping 26 matching lines @@
 
 bool IdTargetObserverRegistry::hasObservers(const AtomicString& id) const
 {
     if (id.isEmpty() || m_registry.isEmpty())
         return false;
     ObserverSet* set = m_registry.get(id.impl());
     return set && !set->isEmpty();
 }
 
 } // namespace WebCore