Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/sparse_control.h

Index: net/disk_cache/blockfile/sparse_control.h
diff --git a/net/disk_cache/sparse_control.h b/net/disk_cache/blockfile/sparse_control.h
similarity index 96%
rename from net/disk_cache/sparse_control.h
rename to net/disk_cache/blockfile/sparse_control.h
index a018e18742ed95b85f7b56fcfa287ea9bf667e7c..d3450a3eaecfba354733892305fa0d92dfd8cbb1 100644
--- a/net/disk_cache/sparse_control.h
+++ b/net/disk_cache/blockfile/sparse_control.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef NET_DISK_CACHE_SPARSE_CONTROL_H_
-#define NET_DISK_CACHE_SPARSE_CONTROL_H_
+#ifndef NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_H_
+#define NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_H_
 
 #include <string>
 #include <vector>
@@ -11,8 +11,8 @@
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "net/base/completion_callback.h"
-#include "net/disk_cache/bitmap.h"
-#include "net/disk_cache/disk_format.h"
+#include "net/disk_cache/blockfile/bitmap.h"
+#include "net/disk_cache/blockfile/disk_format.h"
 
 namespace net {
 class IOBuffer;
@@ -174,4 +174,4 @@ class SparseControl {
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_SPARSE_CONTROL_H_
+#endif  // NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_H_