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

Source/core/html/HTMLMediaElement.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple 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 274 matching lines @@
 
     virtual void reportMemoryUsage(MemoryObjectInfo*) const;
 
 protected:
     HTMLMediaElement(const QualifiedName&, Document*, bool);
     virtual ~HTMLMediaElement();
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual void finishParsingChildren();
     virtual bool isURLAttribute(const Attribute&) const OVERRIDE;
-    virtual void attach() OVERRIDE;
+    virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
 
     virtual void didMoveToNewDocument(Document* oldDocument) OVERRIDE;
 
     enum DisplayMode { Unknown, None, Poster, PosterWaitingForVideo, Video };
     DisplayMode displayMode() const { return m_displayMode; }
     virtual void setDisplayMode(DisplayMode mode) { m_displayMode = mode; }
     
     virtual bool isMediaElement() const { return true; }
 
     // Restrictions to change default behaviors.
@@ skipping 295 matching lines @@
 
 inline HTMLMediaElement* toMediaElement(Node* node)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!node || isMediaElement(node));
     return static_cast<HTMLMediaElement*>(node);
 }
 
 } //namespace
 
 #endif