[bindings] Remove custom binding usage from CryptoKey.idl

Source/modules/crypto/CryptoKey.h

 /*
  * Copyright (C) 2013 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 36 matching lines @@
 public:
     static CryptoKey* create(const WebCryptoKey& key)
     {
         return new CryptoKey(key);
     }
 
     ~CryptoKey();
 
     String type() const;
     bool extractable() const;
+    ScriptValue algorithm(ScriptState*);
     Vector<String> usages() const;
 
     const WebCryptoKey& key() const { return m_key; }
 
     // If the key cannot be used with the indicated algorithm, returns false
     // and completes the CryptoResult with an error.
     bool canBeUsedForAlgorithm(const WebCryptoAlgorithm&, WebCryptoKeyUsage, CryptoResult*) const;
 
     // On failure, these return false and complete the CryptoResult with an error.
     static bool parseFormat(const String&, WebCryptoKeyFormat&, CryptoResult*);
     static bool parseUsageMask(const Vector<String>&, WebCryptoKeyUsageMask&, CryptoResult*);
 
     DEFINE_INLINE_TRACE() { }
 
 protected:
     explicit CryptoKey(const WebCryptoKey&);
 
     const WebCryptoKey m_key;
 };
 
 } // namespace blink
 
 #endif // CryptoKey_h