Reorganize net/disk_cache into backend specific directories.

net/disk_cache/errors.h

-// Copyright (c) 2012 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.
-
-// Error codes reported by self tests or to UMA.
-
-#ifndef NET_DISK_CACHE_ERRORS_H__
-#define NET_DISK_CACHE_ERRORS_H__
-
-namespace disk_cache {
-
-enum {
-  ERR_NO_ERROR = 0,
-  ERR_INIT_FAILED = -1,
-  ERR_INVALID_TAIL = -2,
-  ERR_INVALID_HEAD = -3,
-  ERR_INVALID_PREV = -4,
-  ERR_INVALID_NEXT = -5,
-  ERR_INVALID_ENTRY = -6,
-  ERR_INVALID_ADDRESS = -7,
-  ERR_INVALID_LINKS = -8,
-  ERR_NUM_ENTRIES_MISMATCH = -9,
-  ERR_READ_FAILURE = -10,
-  ERR_PREVIOUS_CRASH = -11,
-  ERR_STORAGE_ERROR = -12,
-  ERR_INVALID_MASK = -13,
-  ERR_CACHE_DOOMED = -14,   // Not really an error condition.
-  ERR_CACHE_CREATED = -15   // Not really an error condition.
-};
-
-}  // namespace disk_cache
-
-#endif  // NET_DISK_CACHE_ERRORS_H__