Revert of Add domain-specific language for BPF policies

sandbox/linux/bpf_dsl/cons.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 SANDBOX_LINUX_BPF_DSL_CONS_H_
-#define SANDBOX_LINUX_BPF_DSL_CONS_H_
-
-#include "base/memory/ref_counted.h"
-#include "sandbox/sandbox_export.h"
-
-namespace sandbox {
-
-// Cons provides an immutable linked list abstraction as commonly
-// provided in functional programming languages like Lisp or Haskell.
-template <typename T>
-class Cons : public base::RefCounted<Cons<T> > {
- public:
-  // List provides an abstraction for referencing a list of zero or
-  // more Cons nodes.
-  typedef scoped_refptr<const Cons<T> > List;
-
-  // Return this node's head element.
-  const T& head() const { return head_; }
-
-  // Return this node's tail element.
-  List tail() const { return tail_; }
-
-  // Construct a new List using |head| and |tail|.
-  static List Make(const T& head, List tail) {
-    return make_scoped_refptr(new const Cons<T>(head, tail));
-  }
-
- private:
-  Cons(const T& head, List tail) : head_(head), tail_(tail) {}
-  virtual ~Cons() {}
-
-  T head_;
-  List tail_;
-
-  friend class base::RefCounted<Cons<T> >;
-  DISALLOW_COPY_AND_ASSIGN(Cons);
-};
-
-}  // namespace sandbox
-
-#endif  // SANDBOX_LINUX_BPF_DSL_CONS_H_