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

Source/core/inspector/InspectorTimelineAgent.cpp

Index: Source/core/inspector/InspectorTimelineAgent.cpp
diff --git a/Source/core/inspector/InspectorTimelineAgent.cpp b/Source/core/inspector/InspectorTimelineAgent.cpp
index 6ff7aa37c75d7f3287ebd8744ef5e568446c90a1..1ab62fbfbe1beacc15d3633fb50aadc0f9a865d0 100644
--- a/Source/core/inspector/InspectorTimelineAgent.cpp
+++ b/Source/core/inspector/InspectorTimelineAgent.cpp
@@ -1191,7 +1191,7 @@ TimelineThreadState& InspectorTimelineAgent::threadState(ThreadIdentifier thread
     ThreadStateMap::iterator it = m_threadStates.find(thread);
     if (it != m_threadStates.end())
         return it->value;
-    return m_threadStates.add(thread, TimelineThreadState(this)).iterator->value;
+    return m_threadStates.add(thread, TimelineThreadState(this)).storedValue->value;
 }
 
 void InspectorTimelineAgent::commitFrameRecord()