Oilpan: move Range object to the oilpan heap.

Source/core/editing/VisiblePosition.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Portions Copyright (c) 2011 Motorola Mobility, 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 702 matching lines @@
     m_deepPosition.formatForDebugger(buffer, length);
 }
 
 void VisiblePosition::showTreeForThis() const
 {
     m_deepPosition.showTreeForThis();
 }
 
 #endif
 
-PassRefPtr<Range> makeRange(const VisiblePosition &start, const VisiblePosition &end)
+PassRefPtrWillBeRawPtr<Range> makeRange(const VisiblePosition &start, const VisiblePosition &end)
 {
     if (start.isNull() || end.isNull())
         return nullptr;
 
     Position s = start.deepEquivalent().parentAnchoredEquivalent();
     Position e = end.deepEquivalent().parentAnchoredEquivalent();
     if (s.isNull() || e.isNull())
         return nullptr;
 
     return Range::create(s.containerNode()->document(), s.containerNode(), s.offsetInContainerNode(), e.containerNode(), e.offsetInContainerNode());
@@ skipping 65 matching lines @@
     if (vpos)
         vpos->showTreeForThis();
 }
 
 void showTree(const WebCore::VisiblePosition& vpos)
 {
     vpos.showTreeForThis();
 }
 
 #endif