Implement Blob.close().

Source/core/html/PublicURLManager.h

 /*
  * 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 27 matching lines @@
 class ExecutionContext;
 class SecurityOrigin;
 class URLRegistry;
 class URLRegistrable;
 
 class PublicURLManager FINAL : public ActiveDOMObject {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     static PassOwnPtr<PublicURLManager> create(ExecutionContext*);
 
-    void registerURL(SecurityOrigin*, const KURL&, URLRegistrable*);
+    void registerURL(SecurityOrigin*, const KURL&, URLRegistrable*, const String& uuid = String());
     void revoke(const KURL&);
+    void revoke(const String& uuid);
 
     // ActiveDOMObject interface.
     virtual void stop() OVERRIDE;
 
 private:
     PublicURLManager(ExecutionContext*);
 
-    typedef HashSet<String> URLSet;
-    typedef HashMap<URLRegistry*, URLSet > RegistryURLMap;
+    // One or more URLs can be associated with the same unique ID.
+    // Objects need be revoked by unique ID in some cases.
+    typedef String URLString;
+    typedef HashMap<URLString, String> URLMap;
+    typedef HashMap<URLRegistry*, URLMap> RegistryURLMap;
+
     RegistryURLMap m_registryToURL;
     bool m_isStopped;
 };
 
 } // namespace WebCore
 
-#endif // PUBLICURLMANAGER_h
+#endif // PublicURLManager_h