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

Source/core/html/shadow/SliderThumbElement.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 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.
@@ skipping 38 matching lines @@
 class SliderThumbElement FINAL : public HTMLDivElement {
 public:
     static PassRefPtr<SliderThumbElement> create(Document*);
 
     void setPositionFromValue();
 
     void dragFrom(const LayoutPoint&);
     virtual void defaultEventHandler(Event*);
     virtual bool willRespondToMouseMoveEvents() OVERRIDE;
     virtual bool willRespondToMouseClickEvents() OVERRIDE;
-    virtual void detach();
+    virtual void detach(const AttachContext& = AttachContext()) OVERRIDE;
     virtual const AtomicString& shadowPseudoId() const;
     HTMLInputElement* hostInput() const;
     void setPositionFromPoint(const LayoutPoint&);
 
 private:
     SliderThumbElement(Document*);
     virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
     virtual PassRefPtr<Element> cloneElementWithoutAttributesAndChildren();
     virtual bool isDisabledFormControl() const OVERRIDE;
     virtual bool matchesReadOnlyPseudoClass() const OVERRIDE;
@@ skipping 51 matching lines @@
 
 private:
     SliderContainerElement(Document*);
     virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
     virtual const AtomicString& shadowPseudoId() const;
 };
 
 }
 
 #endif