Revert of Oilpan: Prepare to move RenderObject and RenderObjectChildList to Oilpan heap.

Source/core/rendering/RenderObject.h

Index: Source/core/rendering/RenderObject.h
diff --git a/Source/core/rendering/RenderObject.h b/Source/core/rendering/RenderObject.h
index dc9a8a07484d64ee50213e2ca94cb30733f75813..7abce5d6c0a698e7259e374ee05f65ce5784835e 100644
--- a/Source/core/rendering/RenderObject.h
+++ b/Source/core/rendering/RenderObject.h
@@ -145,7 +145,7 @@
 #endif
 
 // Base class for all rendering tree objects.
-class RenderObject : public NoBaseWillBeGarbageCollectedFinalized<RenderObject>, public ImageResourceClient {
+class RenderObject : public ImageResourceClient {
     friend class RenderBlock;
     friend class RenderBlockFlow;
     friend class RenderLayerReflectionInfo; // For setParent
@@ -157,7 +157,6 @@
     // marked as anonymous in the constructor.
     explicit RenderObject(Node*);
     virtual ~RenderObject();
-    virtual void trace(Visitor*);
 
     virtual const char* renderName() const = 0;
 
@@ -343,11 +342,9 @@
 
     static RenderObject* createObject(Element*, RenderStyle*);
 
-#if !ENABLE(OILPAN)
     // RenderObjects are allocated out of the rendering partition.
     void* operator new(size_t);
     void operator delete(void*);
-#endif
 
 public:
     bool isPseudoElement() const { return node() && node()->isPseudoElement(); }
@@ -618,7 +615,7 @@
 
     Node* node() const
     {
-        return isAnonymous() ? 0 : m_node.get();
+        return isAnonymous() ? 0 : m_node;
     }
 
     Node* nonPseudoNode() const
@@ -627,7 +624,7 @@
     }
 
     // FIXME: Why does RenderWidget need this?
-    void clearNode() { m_node = nullptr; }
+    void clearNode() { m_node = 0; }
 
     // Returns the styled node that caused the generation of this renderer.
     // This is the same as node() except for renderers of :before and :after
@@ -1166,11 +1163,11 @@
 
     RefPtr<RenderStyle> m_style;
 
-    RawPtrWillBeMember<Node> m_node;
-
-    RawPtrWillBeMember<RenderObject> m_parent;
-    RawPtrWillBeMember<RenderObject> m_previous;
-    RawPtrWillBeMember<RenderObject> m_next;
+    Node* m_node;
+
+    RenderObject* m_parent;
+    RenderObject* m_previous;
+    RenderObject* m_next;
 
 #if ENABLE(ASSERT)
     unsigned m_hasAXObject             : 1;