Ensure DOMWrapperWorld always exists in all webkit_unit_tests

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 97 matching lines @@
     ASSERT(i->value == this);
 
     map.remove(i);
     isolatedWorldCount--;
     ASSERT(map.size() == isolatedWorldCount);
 }
 
 #ifndef NDEBUG
 static bool isIsolatedWorldId(int worldId)
 {
-    return worldId != MainWorldId && worldId != WorkerWorldId;
+    return MainWorldId < worldId  && worldId < IsolatedWorldIdLimit;
 }
 #endif
 
 PassRefPtr<DOMWrapperWorld> DOMWrapperWorld::ensureIsolatedWorld(int worldId, int extensionGroup)
 {
     ASSERT(isIsolatedWorldId(worldId));
 
     WorldMap& map = isolatedWorldMap();
     WorldMap::AddResult result = map.add(worldId, 0);
     RefPtr<DOMWrapperWorld> world = result.storedValue->value;
@@ skipping 72 matching lines @@
     ASSERT(isIsolatedWorldId(worldId));
     isolatedWorldContentSecurityPolicies().remove(worldId);
 }
 
 bool DOMWrapperWorld::contextHasCorrectPrototype(v8::Handle<v8::Context> context)
 {
     return V8WindowShell::contextHasCorrectPrototype(context);
 }
 
 } // namespace WebCore