Fix repaint on :hover for empty elements with a border.

Source/core/rendering/RenderObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1873 matching lines @@
         style->inheritFrom(pseudoStyle.get());
         setStyle(style.release());
         return;
     }
 
     setStyle(pseudoStyle);
 }
 
 inline bool RenderObject::hasImmediateNonWhitespaceTextChildOrPropertiesDependentOnColor() const
 {
+    if (style()->hasBorder() || style()->hasOutline())
+        return true;
     for (const RenderObject* r = firstChild(); r; r = r->nextSibling()) {
         if (r->isText() && !toRenderText(r)->isAllCollapsibleWhitespace())
             return true;
         if (r->style()->hasOutline() || r->style()->hasBorder())
             return true;
     }
     return false;
 }
 
 inline bool RenderObject::shouldRepaintForStyleDifference(StyleDifference diff) const
@@ skipping 1483 matching lines @@
 {
     if (object1) {
         const WebCore::RenderObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
     }
 }
 
 #endif