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

Source/core/inspector/TraceEventDispatcher.cpp

Index: Source/core/inspector/TraceEventDispatcher.cpp
diff --git a/Source/core/inspector/TraceEventDispatcher.cpp b/Source/core/inspector/TraceEventDispatcher.cpp
index bdfbea6fe58dff18b19af8ffc4a6468386c99c35..a75f4a44cfd9bcdae27a0a6d3dd00b61541f2cfc 100644
--- a/Source/core/inspector/TraceEventDispatcher.cpp
+++ b/Source/core/inspector/TraceEventDispatcher.cpp
@@ -106,8 +106,9 @@ void TraceEventDispatcher::innerAddListener(const char* name, char phase, TraceE
         client->setTraceEventCallback(dispatchEventOnAnyThread);
     HandlersMap::iterator it = m_handlers.find(std::make_pair(name, phase));
     if (it == m_handlers.end())
-        it = m_handlers.add(std::make_pair(name, phase), Vector<BoundTraceEventHandler>()).iterator;
-    it->value.append(BoundTraceEventHandler(instance, method));
+        m_handlers.add(std::make_pair(name, phase), Vector<BoundTraceEventHandler>()).storedValue->value.append(BoundTraceEventHandler(instance, method));
+    else
+        it->value.append(BoundTraceEventHandler(instance, method));
 }
 
 void TraceEventDispatcher::removeAllListeners(TraceEventTargetBase* instance, InspectorClient* client)