Make the constructor of a LayoutRect from an IntRect explicit.

Source/modules/accessibility/AXScrollbar.cpp

 /*
  * Copyright (C) 2010 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
@@ skipping 40 matching lines @@
 PassRefPtr<AXScrollbar> AXScrollbar::create(Scrollbar* scrollbar, AXObjectCacheImpl* axObjectCache)
 {
     return adoptRef(new AXScrollbar(scrollbar, axObjectCache));
 }
 
 LayoutRect AXScrollbar::elementRect() const
 {
     if (!m_scrollbar)
         return LayoutRect();
 
-    return m_scrollbar->frameRect();
+    return LayoutRect(m_scrollbar->frameRect());
 }
 
 Document* AXScrollbar::document() const
 {
     AXObject* parent = parentObject();
     if (!parent)
         return 0;
     return parent->document();
 }
 
@@ skipping 31 matching lines @@
         return;
 
     if (!m_scrollbar->scrollableArea())
         return;
 
     float newValue = value * m_scrollbar->maximum();
     m_scrollbar->scrollableArea()->scrollToOffsetWithoutAnimation(m_scrollbar->orientation(), newValue);
 }
 
 } // namespace blink