Reorganize net/disk_cache into backend specific directories.

net/disk_cache/disk_format.cc

Index: net/disk_cache/disk_format.cc
diff --git a/net/disk_cache/disk_format.cc b/net/disk_cache/disk_format.cc
deleted file mode 100644
index 5b08954e0884ae5c4b4651e6111846698406802b..0000000000000000000000000000000000000000
--- a/net/disk_cache/disk_format.cc
+++ /dev/null
@@ -1,15 +0,0 @@
-// 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.
-
-#include "net/disk_cache/disk_format.h"
-
-namespace disk_cache {
-
-IndexHeader::IndexHeader() {
-  memset(this, 0, sizeof(*this));
-  magic = kIndexMagic;
-  version = kCurrentVersion;
-}
-
-}  // namespace disk_cache