Remove tons of OILPAN.

sky/engine/platform/heap/Handle.h

 /*
  * Copyright (C) 2014 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 67 matching lines @@
     private:                                                    \
         __attribute__((annotate("blink_stack_allocated")))      \
         void* operator new(size_t) = delete;                    \
         void* operator new(size_t, NotNullTag, void*) = delete; \
         void* operator new(size_t, void*) = delete;
 
 #else
 #define STACK_ALLOCATED() DISALLOW_ALLOCATION()
 #endif
 
-namespace blink {
-
-class Visitor {
-public:
-    template<typename T>
-    void trace(const T* t)
-    {
-    }
-    template<typename T>
-    void trace(T* t)
-    {
-    }
-    template<typename T>
-    void trace(const T& t)
-    {
-    }
-};
-
 #define DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(type) \
     public:                                            \
         ~type();                                       \
     private:
 #define DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(type) \
     public:                                                    \
         virtual ~type();                                       \
     private:
 
 #define DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(type) \
     type::~type() { }
 
 #define DEFINE_STATIC_REF_WILL_BE_PERSISTENT(type, name, arguments) \
     DEFINE_STATIC_REF(type, name, arguments)
 
-} // namespace blink
-
 #endif