Simpler return value from HashTable::add()/HashMap::add() and others

Source/core/dom/IdTargetObserverRegistry.cpp

Index: Source/core/dom/IdTargetObserverRegistry.cpp
diff --git a/Source/core/dom/IdTargetObserverRegistry.cpp b/Source/core/dom/IdTargetObserverRegistry.cpp
index 45ad4dc1a758096bfe12a44374f2e32a31f5beaf..80bd6b33f63fa29fecd4ff6e32ea79aaf1ca0f39 100644
--- a/Source/core/dom/IdTargetObserverRegistry.cpp
+++ b/Source/core/dom/IdTargetObserverRegistry.cpp
@@ -42,9 +42,9 @@ void IdTargetObserverRegistry::addObserver(const AtomicString& id, IdTargetObser
 
     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)