Clean up unnecessary PassRefPtr.h include in modules

Source/modules/crypto/AesKeyAlgorithm.h

 /*
  * Copyright (C) 2014 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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef AesKeyAlgorithm_h
 #define AesKeyAlgorithm_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "modules/crypto/KeyAlgorithm.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
-#include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 class AesKeyAlgorithm : public KeyAlgorithm {
 public:
     static AesKeyAlgorithm* create(const blink::WebCryptoKeyAlgorithm&);
 
     unsigned short length();
 
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
     explicit AesKeyAlgorithm(const blink::WebCryptoKeyAlgorithm&);
 };
 
 DEFINE_KEY_ALGORITHM_TYPE_CASTS(AesKeyAlgorithm);
 
 } // namespace WebCore
 
 #endif