Oilpan: move RenderObjects off heap.

Source/core/layout/LayoutTableRowTest.cpp

 /*
  * Copyright (C) 2012 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 33 matching lines @@
         m_pageHolder = DummyPageHolder::create(IntSize(800, 600));
         m_row = LayoutTableRow::createAnonymous(&m_pageHolder->document());
     }
 
     virtual void TearDown()
     {
         m_row->destroy();
     }
 
     OwnPtr<DummyPageHolder> m_pageHolder;
-    RawPtrWillBePersistent<LayoutTableRow> m_row;
+    LayoutTableRow* m_row;
 };
 
 TEST_F(LayoutTableRowDeathTest, CanSetRow)
 {
     static const unsigned rowIndex = 10;
     m_row->setRowIndex(rowIndex);
     EXPECT_EQ(rowIndex, m_row->rowIndex());
 }
 
 TEST_F(LayoutTableRowDeathTest, CanSetRowToMaxRowIndex)
@@ skipping 14 matching lines @@
 TEST_F(LayoutTableRowDeathTest, CrashIfSettingUnsetRowIndex)
 {
     ASSERT_DEATH(m_row->setRowIndex(unsetRowIndex), "");
 }
 
 #endif
 
 }
 
 } // namespace blink