Oilpan: move RenderObjects off heap.

Source/core/layout/LayoutTableCellTest.cpp

 /*
  * Copyright (C) 2011 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:
  *
  * 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 27 matching lines @@
     {
         RenderingTest::SetUp();
         m_cell = LayoutTableCell::createAnonymous(&document());
     }
 
     virtual void TearDown()
     {
         m_cell->destroy();
     }
 
-    RawPtrWillBePersistent<LayoutTableCell> m_cell;
+    LayoutTableCell* m_cell;
 };
 
 TEST_F(LayoutTableCellDeathTest, CanSetColumn)
 {
     static const unsigned columnIndex = 10;
     m_cell->setCol(columnIndex);
     EXPECT_EQ(columnIndex, m_cell->col());
 }
 
 TEST_F(LayoutTableCellDeathTest, CanSetColumnToMaxColumnIndex)
@@ skipping 48 matching lines @@
 {
     setBodyInnerHTML("<table><td rowspan='8190'></td></table>");
 
     LayoutTableCell* cell = toLayoutTableCell(document().body()->firstChild()->firstChild()->firstChild()->firstChild()->renderer());
     ASSERT_EQ(cell->rowSpan(), 8190U);
 }
 
 }
 
 } // namespace blink