Remove tons of OILPAN.

sky/engine/core/editing/PositionWithAffinity.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file./*
 
 #include "config.h"
 #include "core/editing/PositionWithAffinity.h"
 
 namespace blink {
 
 PositionWithAffinity::PositionWithAffinity(const Position& position, EAffinity affinity)
     : m_position(position)
     , m_affinity(affinity)
 {
 }
 
 PositionWithAffinity::PositionWithAffinity()
     : m_affinity(DOWNSTREAM)
 {
 }
 
 PositionWithAffinity::~PositionWithAffinity()
 {
 }
 
-void PositionWithAffinity::trace(Visitor* visitor)
-{
-    visitor->trace(m_position);
-}
-
 } // namespace blink