DOMDataStore should be cleared when shutting down worker threads

Source/bindings/v8/DOMWrapperWorld.cpp

 /*
  * Copyright (C) 2009 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 78 matching lines @@
     worlds.append(mainWorld());
     WorldMap& isolatedWorlds = isolatedWorldMap();
     for (WorldMap::iterator it = isolatedWorlds.begin(); it != isolatedWorlds.end(); ++it)
         worlds.append(it->value);
 }
 
 DOMWrapperWorld::~DOMWrapperWorld()
 {
     ASSERT(!isMainWorld());
 
+    dispose();
+
     if (!isIsolatedWorld())
         return;
 
     WorldMap& map = isolatedWorldMap();
     WorldMap::iterator i = map.find(m_worldId);
     if (i == map.end()) {
         ASSERT_NOT_REACHED();
         return;
     }
     ASSERT(i->value == this);
 
     map.remove(i);
     isolatedWorldCount--;
     ASSERT(map.size() == isolatedWorldCount);
 }
 
+void DOMWrapperWorld::dispose()
+{
+    m_domDataStore.clear();
+}
+
 #ifndef NDEBUG
 static bool isIsolatedWorldId(int worldId)
 {
     return MainWorldId < worldId  && worldId < IsolatedWorldIdLimit;
 }
 #endif
 
 PassRefPtr<DOMWrapperWorld> DOMWrapperWorld::ensureIsolatedWorld(int worldId, int extensionGroup)
 {
     ASSERT(isIsolatedWorldId(worldId));
@@ skipping 76 matching lines @@
     ASSERT(isIsolatedWorldId(worldId));
     isolatedWorldContentSecurityPolicies().remove(worldId);
 }
 
 bool DOMWrapperWorld::contextHasCorrectPrototype(v8::Handle<v8::Context> context)
 {
     return V8WindowShell::contextHasCorrectPrototype(context);
 }
 
 } // namespace WebCore