The start and end arguments should be unsigned long in setSelectionRange() function

Source/web/WebAXObject.cpp

 /*
  * Copyright (C) 2009 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 835 matching lines @@
     m_private->setSelection(axSelection);
     return;
 }
 
 unsigned WebAXObject::selectionEnd() const
 {
     if (isDetached())
         return 0;
 
     AXObject::AXRange axSelection = m_private->selectionUnderObject();
-    if (axSelection.focusOffset < 0)
-        return 0;
 
     return axSelection.focusOffset;
 }
 
 unsigned WebAXObject::selectionStart() const
 {
     if (isDetached())
         return 0;
 
     AXObject::AXRange axSelection = m_private->selectionUnderObject();
-    if (axSelection.anchorOffset < 0)
-        return 0;
 
     return axSelection.anchorOffset;
 }
 
 unsigned WebAXObject::selectionEndLineNumber() const
 {
     if (isDetached())
         return 0;
 
     VisiblePosition position = m_private->visiblePositionForIndex(selectionEnd());
@@ skipping 733 matching lines @@
     m_private = object;
     return *this;
 }
 
 WebAXObject::operator PassRefPtrWillBeRawPtr<AXObject>() const
 {
     return m_private.get();
 }
 
 } // namespace blink