Oilpan: fix build after r181070.

Source/core/page/PrintContext.cpp

 /*
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2007 Apple Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 326 matching lines @@
     // Account for shrink-to-fit.
     FloatSize scaledPageSize = pageSizeInPixels;
     scaledPageSize.scale(frame->view()->contentsSize().width() / pageRect.width());
     printContext.computePageRectsWithPageSize(scaledPageSize, false);
     return printContext.pageCount();
 }
 
 void PrintContext::trace(Visitor* visitor)
 {
 #if ENABLE(OILPAN)
+    visitor->trace(m_linkDestinations);
     visitor->trace(m_linkedDestinations);
 #endif
 }
 
 }