DOMDataStore should be cleared when shutting down worker threads

Source/bindings/v8/DOMWrapperWorld.cpp

Index: Source/bindings/v8/DOMWrapperWorld.cpp
diff --git a/Source/bindings/v8/DOMWrapperWorld.cpp b/Source/bindings/v8/DOMWrapperWorld.cpp
index 30f1911f4df2e4cdc7c332524212fe9c87e0ba68..53fb4caf17dabc62f48cd890f0cb6e9c2d13ab63 100644
--- a/Source/bindings/v8/DOMWrapperWorld.cpp
+++ b/Source/bindings/v8/DOMWrapperWorld.cpp
@@ -83,7 +83,7 @@ static WorldMap& isolatedWorldMap()
     return map;
 }
 
-void DOMWrapperWorld::allWorldsInMainThread(Vector<RefPtr<DOMWrapperWorld> >& worlds)
+void DOMWrapperWorld::allWorldsInMainThread(Vector<DOMWrapperWorld*>& worlds)
 {
     ASSERT(isMainThread());
     worlds.append(mainWorld());
@@ -96,6 +96,8 @@ DOMWrapperWorld::~DOMWrapperWorld()
 {
     ASSERT(!isMainWorld());
 
+    dispose();
+
     if (!isIsolatedWorld())
         return;
 
@@ -112,6 +114,11 @@ DOMWrapperWorld::~DOMWrapperWorld()
     ASSERT(map.size() == isolatedWorldCount);
 }
 
+void DOMWrapperWorld::dispose()
+{
+    m_domDataStore.clear();
+}
+
 #ifndef NDEBUG
 static bool isIsolatedWorldId(int worldId)
 {