Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/in_flight_backend_io.h

Index: net/disk_cache/blockfile/in_flight_backend_io.h
diff --git a/net/disk_cache/in_flight_backend_io.h b/net/disk_cache/blockfile/in_flight_backend_io.h
similarity index 97%
rename from net/disk_cache/in_flight_backend_io.h
rename to net/disk_cache/blockfile/in_flight_backend_io.h
index 4ff081d07c5beb50c7bc9afbd312a744aba57ece..70438ab81cebaf0b675f6e958074c75261ccdebf 100644
--- a/net/disk_cache/in_flight_backend_io.h
+++ b/net/disk_cache/blockfile/in_flight_backend_io.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_IN_FLIGHT_BACKEND_IO_H_
-#define NET_DISK_CACHE_IN_FLIGHT_BACKEND_IO_H_
+#ifndef NET_DISK_CACHE_BLOCKFILE_IN_FLIGHT_BACKEND_IO_H_
+#define NET_DISK_CACHE_BLOCKFILE_IN_FLIGHT_BACKEND_IO_H_
 
 #include <list>
 #include <string>
@@ -12,7 +12,7 @@
 #include "base/time/time.h"
 #include "net/base/completion_callback.h"
 #include "net/base/io_buffer.h"
-#include "net/disk_cache/in_flight_io.h"
+#include "net/disk_cache/blockfile/in_flight_io.h"
 
 namespace disk_cache {
 
@@ -220,4 +220,4 @@ class InFlightBackendIO : public InFlightIO {
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_IN_FLIGHT_BACKEND_IO_H_
+#endif  // NET_DISK_CACHE_BLOCKFILE_IN_FLIGHT_BACKEND_IO_H_