:hover style not applied on hover if its display property is different from original style's

Source/core/html/shadow/ClearButtonElement.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:
  * 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 29 matching lines @@
         virtual bool shouldClearButtonRespondToMouseEvents() = 0;
         virtual void clearValue() = 0;
     };
 
     static PassRefPtr<ClearButtonElement> create(Document*, ClearButtonOwner&);
     void releaseCapture();
     void removeClearButtonOwner() { m_clearButtonOwner = 0; }
 
 private:
     ClearButtonElement(Document*, ClearButtonOwner&);
-    virtual void detach();
+    virtual void detach(const AttachContext& = AttachContext()) OVERRIDE;
     virtual bool isMouseFocusable() const { return false; }
     virtual void defaultEventHandler(Event*);
     virtual bool isClearButtonElement() const OVERRIDE;
 
     ClearButtonOwner* m_clearButtonOwner;
     bool m_capturing;
 };
 
 inline ClearButtonElement* toClearButtonElement(Element* element)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!element || element->isClearButtonElement());
     return static_cast<ClearButtonElement*>(element);
 }
 
 } // namespace
 
 #endif // ClearButtonElement_h