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

Source/bindings/v8/DOMWrapperMap.h

 /*
  * Copyright (C) 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 73 matching lines @@
     void set(KeyType* key, v8::Handle<v8::Object> wrapper, const WrapperConfiguration& configuration)
     {
         ASSERT(static_cast<KeyType*>(toNative(wrapper)) == key);
         v8::Persistent<v8::Object> persistent(m_isolate, wrapper);
         configuration.configureWrapper(&persistent);
         persistent.SetWeak(this, &setWeakCallback);
         typename MapType::AddResult result = m_map.add(key, UnsafePersistent<v8::Object>());
         ASSERT(result.isNewEntry);
         // FIXME: Stop handling this case once duplicate wrappers are guaranteed not to be created.
         if (!result.isNewEntry)
-            result.iterator->value.dispose();
-        result.iterator->value = UnsafePersistent<v8::Object>(persistent);
+            result.storedValue->value.dispose();
+        result.storedValue->value = UnsafePersistent<v8::Object>(persistent);
     }
 
     void clear()
     {
         v8::HandleScope scope(m_isolate);
         while (!m_map.isEmpty()) {
             // Swap out m_map on each iteration to ensure any wrappers added due to side effects of the loop are cleared.
             MapType map;
             map.swap(m_map);
             for (typename MapType::iterator it = map.begin(); it != map.end(); ++it) {
@@ skipping 23 matching lines @@
 {
     void* key = static_cast<void*>(toNative(data.GetValue()));
     ASSERT(*data.GetParameter()->m_map.get(key).persistent() == data.GetValue());
     data.GetParameter()->removeAndDispose(key);
     releaseObject(data.GetValue());
 }
 
 } // namespace WebCore
 
 #endif // DOMWrapperMap_h