Revert 60378 (trying to track down http://crbug.com/56752 )- Flesh out URLLoa...

webkit/blob/deletable_file_reference.h

-// Copyright (c) 2010 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 WEBKIT_BLOB_DELETABLE_FILE_REFERENCE_H_
-#define WEBKIT_BLOB_DELETABLE_FILE_REFERENCE_H_
-#pragma once
-
-#include "base/file_path.h"
-#include "base/ref_counted.h"
-
-namespace base {
-class MessageLoopProxy;
-}
-
-namespace webkit_blob {
-
-// A refcounted wrapper around a FilePath that schedules the file
-// to be deleted upon final release.
-class DeletableFileReference : public base::RefCounted<DeletableFileReference> {
- public:
-  // Returns a DeletableFileReference for the given path, if no reference
-  // for this path exists returns NULL.
-  static scoped_refptr<DeletableFileReference> Get(const FilePath& path);
-
-  // Returns a DeletableFileReference for the given path, creating a new
-  // reference if none yet exists.
-  static scoped_refptr<DeletableFileReference> GetOrCreate(
-      const FilePath& path, base::MessageLoopProxy* file_thread);
-
-  // The full file path.
-  const FilePath& path() const { return path_; }
-
- private:
-  friend class base::RefCounted<DeletableFileReference>;
-
-  DeletableFileReference(
-      const FilePath& path, base::MessageLoopProxy* file_thread);
-  ~DeletableFileReference();
-
-  const FilePath path_;
-  scoped_refptr<base::MessageLoopProxy> file_thread_;
-
-  DISALLOW_COPY_AND_ASSIGN(DeletableFileReference);
-};
-
-}  // namespace webkit_blob
-
-#endif  // BASE_DELETABLE_FILE_REFERENCE_H_