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

Source/core/dom/custom/CustomElementScheduler.cpp

 /*
  * Copyright (C) 2013 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
@@ skipping 99 matching lines @@
 {
     DEFINE_STATIC_LOCAL(CustomElementScheduler, instance, ());
     return instance;
 }
 
 CustomElementCallbackQueue* CustomElementScheduler::ensureCallbackQueue(PassRefPtr<Element> element)
 {
     Element* key = element.get();
     ElementCallbackQueueMap::iterator it = m_elementCallbackQueueMap.find(key);
     if (it == m_elementCallbackQueueMap.end())
-        it = m_elementCallbackQueueMap.add(key, CustomElementCallbackQueue::create(element)).iterator;
+        return m_elementCallbackQueueMap.add(key, CustomElementCallbackQueue::create(element)).storedValue->value.get();
     return it->value.get();
 }
 
 void CustomElementScheduler::callbackDispatcherDidFinish()
 {
     if (CustomElementMicrotaskDispatcher::instance().elementQueueIsEmpty())
         instance().clearElementCallbackQueueMap();
 }
 
 void CustomElementScheduler::microtaskDispatcherDidFinish()
@@ skipping 26 matching lines @@
         // The processing stack is active.
         CustomElementCallbackDispatcher::instance().enqueue(callbackQueue);
         return callbackQueue;
     }
 
     CustomElementMicrotaskDispatcher::instance().enqueue(callbackQueue);
     return callbackQueue;
 }
 
 } // namespace WebCore