Transform RefCountedDeleteOnMessageLoop to RefCountedDeleteOnSequence.

base/memory/ref_counted_delete_on_message_loop.h

-// Copyright 2013 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 BASE_MEMORY_REF_COUNTED_DELETE_ON_MESSAGE_LOOP_H_
-#define BASE_MEMORY_REF_COUNTED_DELETE_ON_MESSAGE_LOOP_H_
-
-#include "base/location.h"
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/single_thread_task_runner.h"
-
-namespace base {
-
-// RefCountedDeleteOnMessageLoop is similar to RefCountedThreadSafe, and ensures
-// that the object will be deleted on a specified message loop.
-//
-// Sample usage:
-// class Foo : public RefCountedDeleteOnMessageLoop<Foo> {
-//
-//   Foo(scoped_refptr<SingleThreadTaskRunner> loop)
-//       : RefCountedDeleteOnMessageLoop<Foo>(std::move(loop)) {}
-//   ...
-//  private:
-//   friend class RefCountedDeleteOnMessageLoop<Foo>;
-//   friend class DeleteHelper<Foo>;
-//
-//   ~Foo();
-// };
-
-// TODO(skyostil): Rename this to RefCountedDeleteOnTaskRunner.
-template <class T>
-class RefCountedDeleteOnMessageLoop : public subtle::RefCountedThreadSafeBase {
- public:
-  // A SingleThreadTaskRunner for the current thread can be acquired by calling
-  // ThreadTaskRunnerHandle::Get().
-  RefCountedDeleteOnMessageLoop(
-      scoped_refptr<SingleThreadTaskRunner> task_runner)
-      : task_runner_(std::move(task_runner)) {
-    DCHECK(task_runner_);
-  }
-
-  void AddRef() const {
-    subtle::RefCountedThreadSafeBase::AddRef();
-  }
-
-  void Release() const {
-    if (subtle::RefCountedThreadSafeBase::Release())
-      DestructOnMessageLoop();
-  }
-
- protected:
-  friend class DeleteHelper<RefCountedDeleteOnMessageLoop>;
-  ~RefCountedDeleteOnMessageLoop() {}
-
-  void DestructOnMessageLoop() const {
-    const T* t = static_cast<const T*>(this);
-    if (task_runner_->BelongsToCurrentThread())
-      delete t;
-    else
-      task_runner_->DeleteSoon(FROM_HERE, t);
-  }
-
-  scoped_refptr<SingleThreadTaskRunner> task_runner_;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(RefCountedDeleteOnMessageLoop);
-};
-
-}  // namespace base
-
-#endif  // BASE_MEMORY_REF_COUNTED_DELETE_ON_MESSAGE_LOOP_H_