Remove tons of OILPAN.

sky/engine/core/editing/PositionWithAffinity.h

 // 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./*
 
 #ifndef PositionWithAffinity_h
 #define PositionWithAffinity_h
 
 #include "core/dom/Position.h"
 #include "core/editing/TextAffinity.h"
 
 namespace blink {
 
 class PositionWithAffinity {
     DISALLOW_ALLOCATION();
 public:
     PositionWithAffinity(const Position&, EAffinity = DOWNSTREAM);
     PositionWithAffinity();
     ~PositionWithAffinity();
 
     EAffinity affinity() const { return m_affinity; }
     const Position& position() const { return m_position; }
 
-    void trace(Visitor*);
-
 private:
     Position m_position;
     EAffinity m_affinity;
 };
 
 } // namespace blink
 
 #endif // PositionWithAffinity_h