Make DOMWrapperWorld::current() callable from workers

Source/bindings/v8/ScriptController.cpp

 /*
  * Copyright (C) 2008, 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Apple 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.
@@ skipping 244 matching lines @@
             m_isolatedWorlds.set(world->worldId(), isolatedWorldShell.release());
         }
     }
     if (!shell->isContextInitialized() && shell->initializeIfNeeded())
         m_frame->loader().dispatchDidClearWindowObjectInWorld(world);
     return shell;
 }
 
 bool ScriptController::shouldBypassMainWorldContentSecurityPolicy()
 {
+    v8::Handle<v8::Context> context = m_isolate->GetCurrentContext();
+    if (context.IsEmpty() || !toDOMWindow(context))
+        return false;
     DOMWrapperWorld* world = DOMWrapperWorld::current(m_isolate);
-    if (world && world->isIsolatedWorld())
-        return world->isolatedWorldHasContentSecurityPolicy();
-    return false;
+    return world->isIsolatedWorld() ? world->isolatedWorldHasContentSecurityPolicy() : false;
 }
 
 TextPosition ScriptController::eventHandlerPosition() const
 {
     ScriptableDocumentParser* parser = m_frame->document()->scriptableDocumentParser();
     if (parser)
         return parser->textPosition();
     return TextPosition::minimumPosition();
 }
 
@@ skipping 370 matching lines @@
         v8Results = evaluateHandleScope.Escape(resultArray);
     }
 
     if (results && !v8Results.IsEmpty()) {
         for (size_t i = 0; i < v8Results->Length(); ++i)
             results->append(ScriptValue(v8Results->Get(i), m_isolate));
     }
 }
 
 } // namespace WebCore