Sync Blob.close() behavior wrt updated spec.

Source/core/dom/DOMURL.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2012 Motorola Mobility Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 45 matching lines @@
     KURL url(blankURL(), value);
     if (url.isValid()) {
         m_url = url;
         m_input = String();
     } else {
         m_url = KURL();
         m_input = value;
     }
 }
 
-String DOMURL::createObjectURL(ExecutionContext* executionContext, Blob* blob)
+String DOMURL::createObjectURL(ExecutionContext* executionContext, Blob* blob, ExceptionState& exceptionState)
 {
     if (!executionContext || !blob)
         return String();
+    if (blob->hasBeenClosed()) {
+        exceptionState.throwDOMException(InvalidStateError, String(blob->isFile() ? "File" : "Blob") + " has been closed.");
+        return String();
+    }
     return createPublicURL(executionContext, blob, blob->uuid());
 }
 
 String DOMURL::createPublicURL(ExecutionContext* executionContext, URLRegistrable* registrable, const String& uuid)
 {
     KURL publicURL = BlobURL::createPublicURL(executionContext->securityOrigin());
     if (publicURL.isEmpty())
         return String();
 
     executionContext->publicURLManager().registerURL(executionContext->securityOrigin(), publicURL, registrable, uuid);
@@ skipping 13 matching lines @@
 
 void DOMURL::revokeObjectUUID(ExecutionContext* executionContext, const String& uuid)
 {
     if (!executionContext)
         return;
 
     executionContext->publicURLManager().revoke(uuid);
 }
 
 } // namespace WebCore