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

Source/core/dom/custom/CustomElementScheduler.cpp

Index: Source/core/dom/custom/CustomElementScheduler.cpp
diff --git a/Source/core/dom/custom/CustomElementScheduler.cpp b/Source/core/dom/custom/CustomElementScheduler.cpp
index 2d21ad0ee006bb00d4f5506368cbaa7f778defc6..f0ba5cf05c9b046140bcc1cb163d137885881931 100644
--- a/Source/core/dom/custom/CustomElementScheduler.cpp
+++ b/Source/core/dom/custom/CustomElementScheduler.cpp
@@ -117,7 +117,7 @@ CustomElementCallbackQueue* CustomElementScheduler::ensureCallbackQueue(PassRefP
     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();
 }