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

Source/core/rendering/RenderObject.cpp

Index: Source/core/rendering/RenderObject.cpp
diff --git a/Source/core/rendering/RenderObject.cpp b/Source/core/rendering/RenderObject.cpp
index 3e66ef852ef54e20c49eb019e9eb0ca44b7d0956..4db5c5918070ac914af0f20b1068121555da0b79 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -132,7 +132,6 @@
 
 bool RenderObject::s_affectsParentBlock = false;
 
-#if !ENABLE(OILPAN)
 void* RenderObject::operator new(size_t sz)
 {
     ASSERT(isMainThread());
@@ -144,7 +143,6 @@
     ASSERT(isMainThread());
     partitionFree(ptr);
 }
-#endif
 
 RenderObject* RenderObject::createObject(Element* element, RenderStyle* style)
 {
@@ -215,9 +213,9 @@
     : ImageResourceClient()
     , m_style(nullptr)
     , m_node(node)
-    , m_parent(nullptr)
-    , m_previous(nullptr)
-    , m_next(nullptr)
+    , m_parent(0)
+    , m_previous(0)
+    , m_next(0)
 #if ENABLE(ASSERT)
     , m_hasAXObject(false)
     , m_setNeedsLayoutForbidden(false)
@@ -236,14 +234,6 @@
 #ifndef NDEBUG
     renderObjectCounter.decrement();
 #endif
-}
-
-void RenderObject::trace(Visitor* visitor)
-{
-    visitor->trace(m_node);
-    visitor->trace(m_parent);
-    visitor->trace(m_previous);
-    visitor->trace(m_next);
 }
 
 String RenderObject::debugName() const
@@ -2850,9 +2840,8 @@
 
         removeShapeImageClient(m_style->shapeOutside());
     }
-#if !ENABLE(OILPAN)
+
     delete this;
-#endif
 }
 
 PositionWithAffinity RenderObject::positionForPoint(const LayoutPoint&)